St. Louis Circuit Attorney Kim Gardner, right, is the city’s first Black circuit court attorney. On Thursday a circuit court judge disqualified her and her staff from prosecuting the case against Mark McCloskey.

St. Louis Circuit Attorney Kim Gardner, right, and Ronald Sullivan, a Harvard law professor, arrive at the Civil Courts building on May 14, 2018. (Christian Gooden/St. Louis Post-Dispatch/Tribune News Service via Getty Images)