Prosecutors and investigators at the St. Louis County Prosecuting Attorney’s office voted Monday to unionize.

A majority voted by secret ballot to enter the St. Louis Police Officers Association, SLPOA President Ed Clark said in a statement. The election was held under the supervision of retired federal mediator Richard Horn. The association declined to release the vote count.

The SLPOA represents St. Louis city police officers. St. Louis County police are represented by the St. Louis County Police Association.

Ferguson lawyer Wesley Bell takes office next month as the new St. Louis County prosecuting attorney. He defeated longtime chief prosecutor Bob McCulloch in August in the Democratic primary, running on a platform of criminal justice reform. Bell is the first African-American elected to the office.

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