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Julie Vognarthat's where "the usual suspects" came from. The way it's used in "Casablanca," though, the chief of police is telling someone to "round up the usual suspects" for the murder (killing) of a Nazi, when the killer is the hero of the movie and a great friend of his.
So, though the movie starts with "rounding up the usual suspects" in a jail, who subsequently go on a mission together...I suppose that was Kaiser Sousay, too, huh. Yup, makes sense.