That's St. Paul-style policing for you. I remember it well. Vicious and violent.
News accounts say protesters holding a door open precipitated an attack. See @tinadesireeberg.com's video. Gas mask squad was ready.
(They're U.S. Marshals. Doesn't matter; fed and local cops are tight in St. Paul.)
Eileen Clancy 🧿
Outside of the St Paul courthouse, protesters are fighting with agents. The feds are now charging 15 people with impeding immigration enforcement in Minneapolis- under the guise of "antifa". As an aside- in LA they have failed to obtain guilty verdicts in most cases brought against protesters.