Junius Irving Scales, from a prominent Greensboro family that included his great-uncle, Governor Alfred Moore Scales, in 1939 joined the Communist Party of the United States while enrolled at the University of North Carolina in Chapel Hill. He soon became state president of the communist-affiliated American Student Union. In 1946, after serving four years in the U.S. Army, Scales entered UNC as a graduate student and assumed the chairmanship of the Chapel Hill Communist Party. By 1951 he was chairman of the party's Carolinas District, going underground to evade arrest.
In 1954 Scales was apprehended and charged with violating the Alien Registration Act (commonly known as the Smith Act) of 1940, which made it illegal to advocate the violent overthrow of the U.S. government or to organize or become a member of any group espousing such doctrine. At his 1955 trial in the Greensboro federal court, Scales was convicted and sentenced to six years in prison. The conviction was upheld by the Fourth Circuit Court of Appeals but reversed by the U.S. Supreme Court in 1957, shortly after Scales had resigned from the Communist Party. The basis for the reversal was that the government had not provided to the defense the notes and other material of prosecution witnesses. Retried in Greensboro the next year, Scales was represented by Telford Taylor, a nationally recognized expert on the Smith Act, and by McNeill Smith, a prominent local attorney. Scales again maintained that he had never advocated the violent overthrow of the government, but he was again convicted and sentenced to six years' imprisonment. This time the conviction was upheld by the Supreme Court in a five-to-four decision. In October 1961 Scales entered the federal penitentiary in Lewisburg, Penn.; he served 15 months before his sentence was commuted by President John F. Kennedy.