This morning, the world learned of the passing of legendary folk singer Pete Seeger. Take a look at this letter from Seeger to President Kennedy in March of 1961. Seeger was facing trial for contempt of Congress after refusing to testify before the House Un-American Activities Committee. As a fellow Harvard classmate, Seeger was appealing to the President for help.
(From the White House Central Name File, Box 2513, JFK Library)