Nineteen-seventy-one was the year John Lennon left London and pop stardom for a life in New York City as a solo artist, record producer and activist looking to help end the war in Vietnam. He settled in Greenwich Village and quickly came to be seen by the leaders of the faltering anti-war movement as someone who was capable of reinvigorating it. The government was acutely aware of Lennon's power as well, seeing him as a viable threat to Nixon's reelection...