"The Hollywood Ten in November 1947 waiting to be fingerprinted in the U.S. Marshal's office after being cited for contempt of Congress. Front row (from left): Herbert Biberman, attorneys Martin Popper and Robert W. Kenny, Albert Maltz, Lester Cole. Middle row: Dalton Trumbo, John Howard Lawson, Alvah Bessie, Samuel Ornitz. Back row: Ring Lardner Jr., Edward Dmytryk, Adrian Scott."
Source: Wikipedia.