Spock was politically outspoken and active in the movement to end the Vietnam War. In 1968, he and four others (including William Sloane Coffin, Marcus Raskin, Mitchell Goodman, and Michael Ferber) were singled out for prosecution by then Attorney General Ramsey Clark on charges of conspiracy to counsel, aid, and abet resistance to the draft.[13] Spock and three of his alleged co-conspirators were convicted, although the five had never been in the same room together. His two-year prison sentence was never served; the case was appealed and in 1969 a federal court set aside his conviction.[citation needed]