After the burly 300-lb. man was sworn in before the commission, he responded easily to the first two questions: Yes, I am Jackie Presser. Yes, I am the president of the International Brotherhood of Teamsters. But that was it. The head of the nation's largest labor union refused to respond to all other questions on the grounds that his answers might be self-incriminating. The President's Commission on Organized Crime, which subpoenaed Presser to testify during its Chicago hearings on labor racketeering, may ask a federal judge to charge the president of the 2 million-member union with contempt.
If Presser, who was...