Criminals Within (1943)

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At work on a top secret government mission to build a devastating explosive, Army scientist Professor Carroll is murdered before he can reveal the fruits of his labor -- and things only get worse when the professor's colleagues begin disappearing one by one. To track down the unnamed assassin, a… More At work on a top secret government mission to build a devastating explosive, Army scientist Professor Carroll is murdered before he can reveal the fruits of his labor -- and things only get worse when the professor's colleagues begin disappearing one by one. To track down the unnamed assassin, a group of federal agents launches an investigation in which they uncover a truth that's stranger than fiction.