Park Chung-hee
On May 16, 1961, Park Chung-hee, Kim Jong-pil, and Lee Nak-sun successfully staged a military coup d'etat. Immediately after, Park Chung-hee sent aides to try and win over key opposition lawmakers including Lee who rejected Park's request for help. Lee was forced to leave politics and went to the United States where he was vocally opposed to the military coup in Korea and studied Political Science at the University of Pennsylvania.