The President's Commission on Organized Crime urged yesterday that all federal employes and government contractors be required to take tests for drug use or risk being fired.

In a 455-page report to President Reagan on drug use in America, compiled over 2 1/2 years, the commission also suggested that the military take on an increased drug-enforcement role, and that the National Security Agency set up an information system to be shared by all drug-fighting agencies.

The commission also suggested that state and local agencies and private employers consider drug testing.

Warning that individuals who take drugs should not be "packing parachutes or building airplanes," Rodney Smith, the commission's deputy executive director, said, "If you want to work in a sensitive job and get money from the government, you ought to be drug-free . . . . The notion that it is okay to use a little drugs on a sport basis is at the heart of our problem."

Allan Adler, legislative counsel of the American Civil Liberties Union, called the drug-testing recommendation "very irresponsible" and an "unwarranted invasion of the privacy of millions of workers."

"It raises very serious Fourth Amendment issues [concerning] the right to be protected against unreasonable searches and seizures. It appears to advocate a mass dragnet type of screening requiring federal employes to prove they are not drug offenders," Adler said.

The commission, headed by Judge Irving Kaufman of the 2nd U.S. Circuit Court of Appeals, called drug trafficking "the most widespread and lucrative organized crime activity in the United States" with annual income of as much as $110 billion.

The commission said authority for antidrug efforts should rest with the National Drug Enforcement Policy Board, headed by Attorney General Edwin Meese III. But it also called for a greatly expanded role for the military and intelligence services in drug enforcement.

"Giving due consideration to the protection of civil liberties, [an intelligence and operations center] should provide specific roles for all pertinent Department of Defense components and for all members of the intelligence community," the report said. It would also have access to financial information collected by federal authorities.

The commission also calls for repeal of the "Mansfield amendment" to the 1961 Foreign Assistance Act, which provides that agents of the federal Drug Enforcement Administration cannot make arrests or carry weapons in a foreign country without that nation's approval.

The commission also recommended that the Joint Chiefs of Staff be instructed to assist in drug-related intelligence-gathering on the theory that "airborne, amphibious and overland invasion of this country by drug smugglers" should be considered a threat to national security.

The report warns of increasing ties between terrorists and drug traffickers.

"Traffickers supply terrorists with American currency and weapons in return for protection and assistance in smuggling activities. While terrorists and insurgents do not currently control significant portions of the drug trade, the profit potentially realized from even isolated drug transactions could provide sizeable revenues for a militant cause," the report said.

"Terrorists and insurgents funded through drug trafficking could very conceivably become powerful enough to disrupt governments in a number of countries presently allied with the United States, and thus pose a serious threat to this country's national security," it said.

The commission recommended that U.S. entry visas be denied to anyone "suspected" of drug trafficking -- based on information from "any" agency of the United States.

Another major focus of the commission is the ongoing American demand for illegal drugs.

"The war against drugs will not be won until people stop using them. Strategies to reduce supply can do no more than hold the line against illegal drugs while public attitudes and private choices change," the report said.

In an interview, Smith said, "As long as people in this country are willing to pay for dope -- which they are . . . -- all the cops in the world are not going to stop it.

"All the bullets, all the bombs, all the murders are funded $20, $50, $100 at a time out of the pockets of teachers, lawyers, doctors, journalists . . . . If American demand were ended, the whole propblem would dry up," Smith said.

"If people don't want to control it, it's time for them to stop [complaining] when the cops only catch 12 planes out of every hundred," he said.

The commission asked the president to increase funding for drug education and research and urged the 11 states that have decriminalized personal use of marijuana to consider repealing those laws.

It reported widespread drug abuse -- from heroin, marijuana and cocaine to a wide array of pills and synthetic chemicals -- in every segment of society.

In the area of cocaine, for example, the commission found that the drug has been used by 25 million Americans with 5 million to 6 million using the drug on a regular basis. According to the report, cocaine-related deaths increased 77 percent from 1983 to 1984, and emergency room visits related to cocaine use increased 51 percent in the same period.

The report said there is an increased used of heroin by middle-class drug users who try the drug in conjunction with cocaine.