Like much of America during the Vietnam War, the real-life ballad of John and Yoko had a sharp political edge, which is brought to light in this absorbing documentary by David Leaf and John Scheinfeld.

NEWYORKER: The U.S. vs. John Lennon

"We really needed her to speak not only from her point of view as to what they were going through at the time, but to speak for John as well, " said the film's other director, John Scheinfeld.

BBC: NEWS | Entertainment | Lennon filmmakers credit campaign