COINTELPRO (an acronym for Counter Intelligence Program) was a series of covert, and often illegal,<2> projects conducted by the United States Federal Bureau of Investigation (FBI) aimed at surveilling, infiltrating, discrediting, and disrupting domestic political organizations.
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According to attorney Brian Glick in his book War at Home, the FBI used four main methods during COINTELPRO:
1. Infiltration: Agents and informers did not merely spy on political activists. Their main purpose was to discredit and disrupt. Their very presence served to undermine trust and scare off potential supporters. The FBI and police exploited this fear to smear genuine activists as agents.
2. Psychological Warfare From the Outside: The FBI and police used a myriad of other "dirty tricks" to undermine progressive movements. They planted false media stories and published bogus leaflets and other publications in the name of targeted groups. They forged correspondence, sent anonymous letters, and made anonymous telephone calls. They spread misinformation about meetings and events, set up pseudo movement groups run by government agents, and manipulated or strong-armed parents, employers, landlords, school officials and others to cause trouble for activists.
3. Harassment Through the Legal System: The FBI and police abused the legal system to harass dissidents and make them appear to be criminals. Officers of the law gave perjured testimony and presented fabricated evidence as a pretext for false arrests and wrongful imprisonment. They discriminatorily enforced tax laws and other government regulations and used conspicuous surveillance, "investigative" interviews, and grand jury subpoenas in an effort to intimidate activists and silence their supporters.<20>
4. Extralegal Force and Violence: The FBI conspired with local police departments to threaten dissidents; to conduct illegal break-ins in order to search dissident homes; and to commit vandalism, assaults, beatings and assassinations.<20><21><22> The object was to frighten, or eliminate, dissidents and disrupt their movements.More:
http://en.wikipedia.org/wiki/COINTELPRO