The Church Committee is the common term referring to the United States Senate Select Committee to Study Governmental Operations with Respect to Intelligence Activities, a U.S. Senate committee chaired by Senator Frank Church (D-ID) in 1975. A precursor to the U.S. Senate Select Committee on Intelligence, the committee investigated intelligence gathering for illegality by the CIA and FBI after certain activities had been revealed by the Watergate affair.
By the early years of the 1970s, the unpopularity of the Vietnam War and the unfolding Watergate scandal brought the era of minimal oversight to an abrupt halt. Congress was determined to rein in the Nixon administration and to ascertain the extent to which the nation's intelligence agencies had been involved in questionable, if not outright illegal, activities.
A series of troubling revelations started to appear in the press concerning intelligence activities. First came the revelations of Christopher Pyle in January 1970 of the U.S. Army's spying on the civilian population<1><2> and Sam Ervin's Senate investigations that resulted. The dam broke on 22 December 1974, when The New York Times published a lengthy article by Seymour Hersh detailing operations engaged in by the CIA over the years that had been dubbed the "family jewels". Covert action programs involving assassination attempts against foreign leaders and covert attempts to subvert foreign governments were reported for the first time. In addition, the article discussed efforts by intelligence agencies to collect information on the political activities of US citizens.<3>
These revelations convinced many Senators and Representatives that the Congress itself had been too lax, trusting, and naive in carrying out its oversight responsibilities. ...
http://en.wikipedia.org/wiki/Church_Committee