The heroes of One Battle After Another are revolutionaries who communicate in code. Bob Ferguson (Leonardo DiCaprio), though, has been out of the game so long that he’s forgotten how to speak the language. Sixteen years ago, in his previous life as a member of the revolutionary sect known as the French 75, our man walked the walk and talked the talk under the handle “Ghetto Pat,” a nickname that underlined his status as a white boy working with a clique of mostly Black operatives. His job was vaporizing office buildings at the behest of his lover and superior, Perfidia...