A grand jury decision Monday night not to indict a white police officer in the fatal shooting of an unarmed black teenager, Michael Brown, brought renewed criticism of police treatment of minority groups, prompting a small protest outside police union headquarters this morning.

About two dozen demonstrators, holding signs reading "#ThePointIs END POLICE ABUSE" and "#ThePointIs We are all Connected," converged on the offices of the Police Officers Federation of Minneapolis, 1811 University Av. NE, to deliver a letter to union chief John Delmonico calling for more accountability from police leaders.

The letter, published in the Star Tribune last week, demands an apology from Delmonico for recent public comments and a pledge to "ending the racist and abusive culture of MPD, and improving police-community relations."

The two-page letter went on to say:

Delmonico has come under fire for publicly criticizing Mayor Betsy Hodges and questioning her allegiances to the city's police officers, after a photo surfaced of her posing with a young canvasser with a criminal record. Observers said the episode revealed a deeper rift between the mayor and Federation, which represents the city's rank-and-file officers.

Several speakers at the rally Tuesday called for Delmonico's resignation.

"Good cops deserve a leader who will lead with strength and courage - a leader who is willing to face the facts and commit to ending a police culture of racism and abuse," Rev. Jennifer Crow, of First Universalist Church, told a group of reporters.

Another speaker, Jason Sole, a colleague of Delmonico's at Metro State University (where both men teach criminal justice), said that he agreed in principle with the protesters in Ferguson and across the country who took to the streets after the grand jury decision was announced.

"Yeah they should be peaceful, but you can't tell other people how to grieve," he said.

Delmonico didn't immediately respond to a call for comment.