Undercover agents working for the late Mayor Richard J. Daley infiltrated antiwar groups from coast to coast in an effort to sabotage protest demonstrations at the 1968 Democratic National Convention, according to an official document made public yesterday.

The document is a 38-page statement prepared less than two weeks after the violence-marred convention by John J. Clarke of the Chicago Department of Investigation, an agency Daley established to provide himself with intelligence information.

According to Clarke's statement, Daley's undercover men in New York "joined the Radical Organizing Committee, and continually sabotaged their plans for chartering buses, raising money and giving life to the invasion of Chicago. As a result of our activities in New York, instead of 200 busloads of demonstrators coming to Chicago, they ended up with eight carloads, totaling 60 people."

In San Francisco, Oakland and Los Angeles, other investigators infiltrated groups "in an attempt to sabotage the movement with great success," the statement said.

The statement added that in June, two months before the convention, the National Mobilization Committee to End the War in Vietnam, which organized the demonstrators, sought volunteer workers in Chicago "and the Department of Investigation provided them with two . . . In addition to feeding us information, these investigators . . . would handle the phone in the National Mobilization Committee headquarters in Chicago, and when they had some privacy, dissuaded all out-of-town callers from coming to the city."

According to the statement, one of the undercover agents was asked by the committee to solicit housing for incoming demonstrators: "We helped him along by providing four apartment in Old Town [an area north of downtown] . . . Luckily, one of the apartments we provided became a communications center. Valuable information regarding the demonstrator's plans was received from this communications center."

The statement does not say how the information was received.

"We also purposely employed one individual we knew would be a double agent," the statement added.

"We approached him . . . knowing full well he would give any information we [gave] him . . . to the National Mobilization Committee. So, from the first of August through the convention, the Department of Investigation fed the National Mobilization Committee a considerable amount of bad information, resulting in their changing of plans on a week-to-week basis."

Clarke said that on Aug. 25, during the convention, "One of our undercover people became a leader of the . . . demonstration in front of the Hilton Hotel, and at an opportune time led the demonstrators away from the Hilton."

Clarke's statement was among tens of thousands of pages of Chicago Police intelligence files surrendered under a subpoena in a U.S. District Court suit filed by the American Civil Liberties Union.

The statement was released at a press conference yesterday by Don Rose, a plaintiff in the ACLU suit, who was press secretary for the National Mobilization Committee during the convention.

"The Clarke statement is clearly self-serving and inaccurate in many respects," Rose said. "It reflects some of the city's hysteria in the months preceding the convention, but most of all it proves that governmental intervention against a legitimate protest movement extended far beyond spy tactics and well into subversion of its operations."