Why was Pauling accused of being a double agent?

Linus Pauling was accused of being a double agent primarily due to his outspoken opposition to nuclear weapons and his advocacy for disarmament during the Cold War. His vocal criticisms of U.S. military policies and involvement in nuclear arms race led some to suspect that he was sympathetic to communist ideologies. Additionally, his connections with various leftist organizations and public figures heightened the scrutiny around him, causing some to label him as a potential traitor or double agent, despite a lack of evidence to substantiate such claims.