re: What is/are the biggest unsovled crime(s) in America?

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The Villisca axe murders occurred between the evening of June 9, 1912, and early morning of June 10, 1912, in the town of Villisca in southwestern Iowa. The six members of the Moore family and two house guests were found bludgeoned in the Moore residence. All eight victims, including six children, had severe head wounds from an axe. A lengthy investigation yielded several suspects, one of whom was tried twice. The first trial ended in a hung jury and the second in an acquittal. The crime remains unsolved.

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