Intelligence Activities and the Rights of Americans: Political Abuse of Intelligence Information [open pdf - 136KB]
"The Committee finds that information has been collected and disseminated in order to serve the purely political interests of an intelligence agency or the administration, and to influence social policy and political action. The FBI's ability to gather information without effective restraints gave it enormous power. That power was inevitably attractive to politicians, who could use information on opponents and critics for their own advantage, and was also an asset to the Bureau, which depended on politicians for support. In the political arena, as in other facets of American life touched by the intelligence community, the existence of unchecked power led to its abuse."
Intelligence Activities and the Rights of Americans - Book II (1976)