“For months, the U.S. Department of Justice has been calling violent protests where officers were shot at and had Molotov cocktails thrown at them ‘constitutionally protected exercises of freedom of speech, freedom of assembly and freedom of expression,’” Roorda said.

“Now a police officer does nothing more than wear another officer’s name on his sleeve, an officer who has been exonerated of any wrongdoing, and is being told that his passive statement is constitutionally prohibited free speech. There is something wrong with this picture.”

Wilson’s shooting of Michael Brown and a grand jury decision not to indict Wilson, who said he acted in self-defense, have led to daily protests in the St. Louis area against aggressive policing and racial profiling.

About 100 protesters who had gathered Friday morning at Kiener Plaza marched to City Hall in a Christmas-themed demonstration. They quickly noticed the officer with the “Wilson” name tag.

It “shows whose side he’s on,” protester Marcellus Butler said Friday. “I clench my fist. I want to attack, like they want to attack us. I know damn well they know Darren Wilson wasn’t attacking in self-defense. Darren Wilson had an option to Mace him. But he got to shoot.”