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.
Regardless of what you think about China, you need to realize that you, as an American, do not get to dictate to over a billion people about how they should organize their society. Chinese people can handle their own affairs, if they desired the overthrow of the CPC, they could make that happen. They by and large do not desire this, in fact the CPC is broadly popular with tens of millions of Chinese citizens. Do not even try to dismiss that fact with some foolishness like "propaganda" or "brainwashing" ect.
You know nothing about Chinese life or how an average citizen feels about their government there, reading foreign press doesn't offer any insight into that. The nation-state of China is one of the oldest and most influential human institutions in history, and they will not be ordered around by some imperialist anglos again. I suggest you find a way to reconcile that with your personal opinions about them, and recognize that 1.4 billion people do not and will never have to care about you or what you think about them. So either give up your leftist aesthetics and just accept you are an imperialist, or figure out how to treat Chinese people as an equal competitor if not a friend.