Today I learned from Wikipedia that Jackie Robinson refused to go to the back of a bus 11 years prior to Rosa Parks’ refusal, suffering racist mistreatment by the military as a result:

An event on July 6, 1944 derailed Robinson’s military career. While awaiting results of hospital tests on the ankle he had injured in junior college, Robinson boarded an Army bus with a fellow officer’s wife; although the Army had commissioned its own unsegregated bus line, the bus driver ordered Robinson to move to the back of the bus. Robinson refused. The driver backed down, but after reaching the end of the line, summoned the military police, who took Robinson into custody. When Robinson later confronted the investigating duty officer about racist questioning by the officer and his assistant, the officer recommended Robinson be court-martialed. After Robinson’s commander in the 761st, Paul L. Bates, refused to authorize the legal action, Robinson was summarily transferred to the 758th Battalion—where the commander quickly consented to charge Robinson with multiple offenses, including, among other charges, public drunkenness—even though Robinson did not drink.