(CNN) In one of the most prominent cases against far-right groups that the Justice Department alleges planned to storm the US Capitol on January 6 , a New York member of the Proud Boys has pleaded guilty to felony charges, including conspiracy. Matthew Greene, 34, of Syracuse, New York, is the first Proud Boy charged in the alleged conspiracy to plead guilty, and could provide vital information to the government's investigation as he's expected to cooperate. He pleaded guilty Wednesday to one count of conspiracy and one count of obstruction of an official proceeding. Greene could face up to 51...