Nelson Mandela's whirlwind 12-day tour of the United States, which is to begin Wednesday in New York, has been billed as a chance for the South African black leader to thank American supporters, raise money and push for sanctions against the South African government.

But the visit also has allowed some of his supporters to promote their cause in a more subtle way, by snubbing those perceived as being too friendly to the South African government and its system of racial separation, called apartheid.

As a result, the Mandela entourage appears to have rebuffed invitations and offers from people, businesses and even entire cities because they are not viewed as vigorous supporters of the goals of Mandela's African National Congress. Chicago and San Francisco, two cities whose leaders invited Mandela to visit, were told by ANC leaders that they were excluded for this reason. Corporations, most notably the Coca-Cola Co., have been told that their plentiful funds and clout are not welcome until they stop doing business with the South African government.

The rejections, especially of corporations that the ANC has deemed politically unacceptable, have made it more difficult to raise an estimated $400,000 for trip expenses, as well as millions sought to help thousands of refugees who want to return to South Africa.

Some of those organizing the Mandela visit have said privately that they do not agree with this ANC position, and are trying to smooth some of the ruffled feathers in hopes of gaining both political and financial support for increasing pressure on the South African government.

For example, Mandela is scheduled to talk with about 200 business leaders in New York Friday at a closed breakfast meeting. An official helping organize the tour said that many of these executives are from companies with business ties to South Africa.

When Mandela was released after 27 years in prison on Feb. 11, President Bush invited him to the United States. But the visit is not official, and the black leader comes here as a private citizen, with no government assistance to pay expenses for him or his entourage of about 24 people. Instead of the full-fledged Secret Service protection given state visitors, Mandela and his party will be protected by the security arm of the State Department.

A State Department spokesman, who said that U.S. officials expect "very, very large crowds at each stop," called the entire trip "the largest and most complicated security operation that our department has ever mounted for any visitor."

At each stop -- New York, Boston, Washington, Atlanta, Miami, Detroit, Los Angeles and Oakland -- organizers say that additional security and crowd control are expected to be provided by local and state police.

Even as U.S. supporters prepared to greet Mandela, however, organizers said his schedule still is not firm. A spokesman for the tour said last week that a final schedule may not be available until Monday, in part because Mandela, who will be 72 next month and is said to have tired during his current European tour, may want to rearrange his plans.

The other complication has been that local committees have recommended schedules and details of each stop, while the executive committee of the Nelson Mandela Welcome Committee in Washington has struggled to maintain final control over the entire trip. Details of the tour, which campaign experts said normally would take months to organize, have been put together only in the last few weeks, several of those participating in the operation said. One described the process as "having weddings simultaneously in eight different cities."

Experts from several presidential campaigns had been hired recently to organize the complicated events in each city, however. "It's coming together," said one weary worker.

Insiders said that besides political views that have complicated the organizing of this tour, Mandela's supporters have vigorously disagreed about the best ways to use the black leader's time and perhaps limited energy, and the safest ways to maneuver him through this difficult trip.

As tour coordinator Roger Wilkins said last week, for all the desire to let the maximum number of people see Mandela, "I would not like to imagine what South Africa would be like without this man's power and force and intellect." Thus, many have been told that they would not get a chance to meet Mandela on this trip.

Tour organizers did not want to give specifics about who or what has been shed from the schedule, unless the reasons were political. For example, Randall Robinson, executive director of TransAfrica and one of the trip organizers, said in a statement last week that Mandela will bypass Chicago because he wants to "focus on cities that are friendly to the struggle in South Africa."

A spokeswoman for a Chicago group helping to organize Mandela's tour was quoted in the Chicago Tribune as saying that the group had advised against visiting Chicago. "The local chapter simply does not wish to give Mayor {Richard} Daley any international exposure because he had done nothing regarding sanctions against South Africa," Pam Davies said.

Asked last week whether Chicago was being rebuffed because the city permits its contractors to continue limited relations with South Africa, Daley said: "That's a bunch of b.s. I don't own any interest in South Africa. Why don't you ask other public officials across the country that question?"

In other cities such as San Francisco, officials offered other explanations for not being part of the tour. Mayor Art Agnos said Mandela, whose tour is to finish in Los Angeles and Oakland on July 1, is skipping San Francisco because an exhibit of Dutch painting scheduled for February at the M.H. de Young Memorial Museum was to be sponsored by Royal Dutch Shell Oil.

When critics began citing Shell as a company with substantial holdings in South Africa, the museum's board of supervisors voted last week to find new sponsorship for the exhibit.

In an effort to ease any bruised feelings in San Francisco, Amos C. Brown, co-chair of the Northern California Mandela reception committee, said the planned visit to Oakland is really a visit to northern California. Brown said he did not support efforts to rebuff some of those without proper political credentials.

"For me, none of these communities are all that clean," he said.

Mandela's scheduled stop in Boston Saturday has ignited criticism of his political views from some city officials. City Councilor James Kelly last week objected to plans to fly the ANC flag at Boston City Hall. When he learned about the possibility of Mandela meeting with Puerto Rican nationalists in New York, Kelly exploded.

"Now Nelson Mandela is embracing these three who tried to overthrow the U.S. government," Kelly told reporters. "I suspect that next they will lead a movement to free Sirhan Sirhan {the man who assassinated Robert Kennedy.} Is he a political prisoner as well?"

But if Kelly is kicking up a fuss, other Bostonians, including many members of the business community, have worked hard to support Mandela's visit to their town. Reebok International has printed thousands of T-shirts to be sold for the Mandela cause. A communications company has donated $100,000 worth of paint for billboards along Mandela's route through the city.

ANC officials said they turned down offers of assistance from the Coca-Cola Co., based in Atlanta, the fourth stop on Mandela's tour. Coke divested itself of its bottling plants in South Africa four years ago, but continues to ship its concentrate to the country and still controls 70 percent of the cola market there.

The decision to stiff Coca-Cola is controversial among some Georgians who believe the company has been working to support black issues in recent years. Rep. John Lewis (D-Ga.), whose district covers part of Atlanta, said of the refusal to take Coke's help, "I think that's unfortunate. In Atlanta, you don't do much without Coca-Cola. And Coca-Cola has been a very responsible corporate citizen."

Moreover, Coca-Cola is sold at five of the stadiums where Mandela is scheduled to speak to thousands of his supporters. Some of Mandela's followers were trying to ban the drink sales during Mandela's speeches. Sifio Makhathini, chairman of the Atlanta chapter of the ANC, said last week: "It would offend Mr. Mandela to sell Coke during the rally."

There are methods of raising money for the trip other than corporate donations and drink sales, organizers said last week, including the T-shirts and other souvenirs sold for the ANC. Tickets to rallies are on sale for $5-$10. About 25,000 tickets at $5 each were sold by Friday afternoon for the Oakland Coliseum rally on June 30. Some tickets to smaller, fund-raising dinners are running about $2,500.

At some events, the best seats are expected to cost more. And private donations have come in, reportedly from such stars as Eddie Murphy.

William Lucy of the American Federation of State, County and Municipal Employees, whose convention Mandela will address in Miami, said that labor has contributed about $200,000 so far for Mandela's tour. "This is a joint venture on our part," Lucy said of the trip.

Trip organizers hope that when the tour has finished, some money will be left to help push the ANC cause in South Africa. "Our needs are enormous," said Lindiwe Mabuza, chief ANC representative to the United States. Only recently allowed to operate openly in South Africa, after decades of banishment, the ANC needs $100 million to $200 million to pay for offices, transportation and access to the media, she said.

When asked whether money will be left after the tour, trip coordinator Roger Wilkins said, "We expect to do substantially better at managing our budget than the U.S. government."

Special correspondents Christopher B. Daly in Boston and Debbie Goldberg in Philadelphia contributed to this report.

Early morning arrival at John F. Kennedy International Airport. Official welcoming ceremony.

Lunchtime ticker-tape parade in Manhattan, ending at City Hall reception.

Evening meeting with South African exile community. JUNE 21, NEW YORK

Morning ecumenical service at Riverside Church.

Evening motorcade in Harlem, rally at the Harlem State Office Building, meeting with black journalists.

Evening rally at Yankee Stadium. JUNE 22, NEW YORK

Breakfast with business community.

Morning address to the U.N. General Assembly, followed by news conference.

Evening private meetings with anti-apartheid activists.JUNE 23, BOSTON

Morning community meeting with students at Madison Park High School.

Lunch at John F. Kennedy Library with prominent Americans, including members of the Kennedy family.

Midday public rally at the Esplanade. JUNE 24, WASHINGTON

Meetings with members of the African National Congress, the South African exile community and the African diplomatic corps. JUNE 25, WASHINGTON

11 a.m., meeting with President Bush.

4 p.m., meeting with Secretary of State James A. Baker III.

5:40 p.m., meeting with AFL-CIO executive council. JUNE 26, WASHINGTON

8 a.m., breakfast with Congressional Black Caucus.

11 a.m., speech to joint session of Congress.

Afternoon meetings with congressional leaders.

7 p.m., rally at D.C. Convention Center.JUNE 27, ATLANTA

Morning welcome at airport.

Morning wreath-laying ceremony at grave of the Rev. Martin Luther King Jr., followed by a civil rights tribute.

Afternoon convocation at Morehouse College, with presentation of honorary degrees from predominantly black colleges and universities.

Evening rally at Grant Field stadium. JUNE 28, MIAMI and DETROIT

Morning speech to convention of the American Federation of State, County and Municipal Employees at Miami Beach convention center.

About 3 p.m., arrival in Detroit.

Visit to Ford River Rouge assembly plant.

Evening rally at Tiger Stadium.JUNE 29, DETROIT and LOS ANGELES

Breakfast with midwestern South African community.

Late morning (Pacific time) arrival at Los Angeles International Airport, with welcoming ceremony and reception at City Hall.

Evening rally and concert at Hollywood Coliseum. JUNE 30, OAKLAND

Late morning welcome at airport.

1 p.m., rally at Oakland-Alameda County Stadium.

Afternoon private meeting with South African community.

7 p.m., reception. JULY 1