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In page Anton Cermak:

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Author Ronald Humble provides yet another perspective as to why Cermak was killed. In his book Frank Nitti: The True Story of Chicago’s Notorious Enforcer, Humble contends that Cermak was as corrupt as Thompson, and that the Chicago Outfit hired Zangara to kill Cermak in retaliation for Cermak's attempt to murder Frank Nitti.[citation needed]