In the fifties, the most effective sanction was terror. Almost any publicity from HUAC meant the 'blacklist.' Without a chance to clear his name, a witness would suddenly find himself without friends and without a job. But it is not easy to see how in 1969 a HUAC blacklist could terrorize an SDS activist. Witnesses like Jerry Rubin have openly boasted of their contempt for American institutions. A subpoena from HUAC would be unlikely to scandalize Abbie Hoffman or his friends.