[1][2] His name appeared in the earliest Hollywood blacklist: a list of Communist sympathizers along with Dalton Trumbo, Maurice Rapf, Lester Cole, Howard Koch, John Wexley, Ring Lardner Jr., Harold Salemson, Henry Meyers, Theodore Strauss, and John Howard Lawson.
[3] On April 17, 1947, Buchman, actress Anne Revere, and writer Sam Moore pled the Fifth Amendment regarding questions about Communist affiliation.
[6] In March 1952, Buchman defended: Maurice Braverman, George Meyers, Roy Wood, Dorothy Rose Blumberg (wife of Albert Blumberg), Philip Frankfeld, and Regina Frankfeld (all members of the Communist Party branch of Maryland and the District of Columbia).
[1] In 1952, Royal Wilbur France, civil liberties activist and president of the National Lawyers Guild, consulted NLG members Joseph Forer and Buchman.
[9][10] In 1971, Buchman defended Arthur F. Turco Jr., a New York lawyer charged in connection with the 1969 torture and murder of a suspected Black Panthers police informer.