John Lennon, born 75 years ago on October 9, 1940, was a musical genius and pop cultural icon.

He was also a vocal peace protester and anti-war activist and a high-profile example of the lengths to which the U.S. government will go to persecute those who dare to challenge its authority.

Long before Chelsea Manning and Edward Snowden were being castigated for blowing the whistle on the government's war crimes and the National Security Agency's abuse of its surveillance powers, it was Lennon who was being singled out for daring to speak truth to power about the government's warmongering, his phone calls monitored and data files collected on his activities and associations.

For a little while, at least, Lennon became enemy number one in the eyes of the U.S. government.

Years after Lennon's assassination it would be revealed that the FBI had collected 281 pages of files on him, including song lyrics, a letter from J. Edgar Hoover directing the agency to spy on the musician, and various written orders calling on government agents to set the stage to set Lennon up for a drug bust. As reporter Jonathan Curiel observes, "The FBI's files on Lennon … read like the writings of a paranoid goody-two-shoes."