Probably was Aldrich Aims, he's is one of the best known American double agents and passed a bunch of lie detectors. He did it for money though so he's not as cool as the Cambridge Five in my opinion.

Kendall Myers is his wife Gwendolyn were very based however. They worked for the state department and passed secrets to the Cuban government for 30 years out of ideological loyalty.

According to a "law enforcement official", they were "true believers" in the Cuban system.[11] The United States federal affidavit quoted a diary entry by Kendall Myers as saying, "I can see nothing of value that has been lost by the revolution. The revolution has released enormous potential and liberated the Cuban spirit",[11] and referred to Fidel Castro as "one of the great political leaders of our time."[13] Other entries quoted reference a comparison of health care in the United States and healthcare in Cuba, and "complacency about the poor" in the United States.[11]

Unfortunately they caught him and he is now locked up at ADX Florence supermax facility, where they put all the terrorists.