From Wikipedia: http://en.wikipedia.org/wiki/COINTELPRO
|Federal Bureau of Investigation|
|Common name||Federal Bureau of Investigation|
|Seal of the Federal Bureau of Investigation|
COINTELPRO (an acronym for Counter Intelligence Program) was a series of covert, and often illegal, projects conducted by the United States Federal Bureau of Investigation (FBI) aimed at surveilling, infiltrating, discrediting, and disrupting domestic political organizations.
COINTELPRO tactics included discrediting targets through psychological warfare, planting false reports in the media, smearing through forged letters, harassment, wrongful imprisonment, extralegal violence and assassination. Covert operations under COINTELPRO took place between 1956 and 1971; however, the FBI has used covert operations against domestic political groups since its inception.  The FBI's stated motivation at the time was "protecting national security, preventing violence, and maintaining the existing social and political order." 
FBI records show that 85% of COINTELPRO resources targeted groups and individuals that the FBI deemed "subversive,"  including communist and socialist organizations; organizations and individuals associated with the civil rights movement, including Dr. Martin Luther King, Jr. and others associated with the Southern Christian Leadership Conference, the National Association for the Advancement of Colored People, and the Congress of Racial Equality and other civil rights organizations; black nationalist groups; the American Indian Movement; a broad range of organizations labeled " New Left", including Students for a Democratic Society and the Weathermen; almost all groups protesting the Vietnam War, as well as individual student demonstrators with no group affiliation; the National Lawyers Guild; organizations and individuals associated with the women's rights movement; nationalist groups such as those seeking independence for Puerto Rico and a United Ireland; and additional notable Americans, such as Albert Einstein. The remaining 15% of COINTELPRO resources were expended to marginalize and subvert " white hate groups," including the Ku Klux Klan and the National States' Rights Party. 
FBI Director J. Edgar Hoover issued directives governing COINTELPRO, ordering FBI agents to "expose, disrupt, misdirect, discredit, or otherwise neutralize" the activities of these movements and their leaders.