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Prosecutors: Members of extremist groups coordinated before Capitol riot

04:07

A newly-filed court document alleges members of extremist groups coordinated with each other before January’s deadly riot on Capitol Hill. Federal prosecutors say the man accused of being a leader of the “Oath Keepers” was in contact with members of other extremist groups, like the Proud Boys as early as mid-December. NBC News’ Pete Williams reports on the court findings.