Roger Stone belonged to an encrypted group chat involving the leader of the Proud Boys and the leader of the Oath Keepers in the months leading up to Jan. 6, 2021. The chat was named F.O.S. or “Friends of Stone” and was mentioned in Tuesday’s Jan. 6 Select Committee hearing, which promised to expose ties between allies of former President Donald Trump and extremist groups. The existence of the encrypted chat was first reported in May by the New York Times , which said it had as many as 47 members. In addition to Proud Boy chairman Enrique Tarrio and...