 More than 200 black sailors are exonerated posthumously by the U.S. Navy after they were unjustly punished for a deadly port explosion in California 80 years ago today as munitions being loaded onto a cargo ship detonated, setting off larger blasts, killing more than 300 sailors and civilians. Black sailors working the docks had raised concern about loading operations and refused to return to loading ships shortly after the blast with no safety improvements. Fifty were sent to prison for conspiracy to commit mutiny.