NEWYou can now listen to Fox News articles! An American citizen admitted to working on behalf of Chinese intelligence operatives for years, helping gather information on U.S. targets and attempting to penetrate American political circles, according to federal authorities.Thomas Weir Pauken II, 50, pleaded guilty Thursday to acting inside the U.S. as an agent of the People's Republic of China without notifying the attorney general, the Department of Justice announced.The guilty plea prompted a stark warning from the FBI, which said the case demonstrates how far the Chinese Communist Party is willing to go to collect intelligence and influence activities…