A little known but extremely important part of the history of domestic surveillance by intelligence agencies is the CACTUS program. CACTUS was a highly classified channel used by agencies like the Central Intelligence Agency and the Federal Bureau of Investigation to transmit information about “the New Left, Black Militants and related matters.” This channel was never disclosed in the Church Committee reports, even when the reports discuss information that was transmitted through CACTUS.

Part of an ongoing investigation into John Lennon, FBI files show informants infiltrated antiwar groups and documented in detail their nefarious activities - even if that activity was training a parrot to swear.

John Lennon’s sizable FBI file begins in the midst of his 1972 deportation battle with INS. While Lennon argued in court that the motive behind the deportation was political, the Bureau worked to secure a narcotics charge that would get him out of the country before the Republican National Convention that year.