The American Civil Liberties Union says The Force, errr, First Amendment is with Sam O'Hara, filing a lawsuit on his behalf after he was handcuffed and detained after following National Guard troops in Washington, D.C. playing the Darth Vader theme from the Star Wars film franchise.
The Guard is an agent of the state. Being this clueless about the First Amendment shows poorly on him as an American, but also suggests poor training by his command structure.
Yes, the MPD are actually the ones who violated his civil rights.