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Floyd Allen
Killed 35 times
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Anna Marie Hahn
Killed 21 times
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From Wikipedia:
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Floyd Allen (July 5, 1858 – March 28, 1913) was an American businessman convicted of murder in 1912, although doubt has been expressed about the validity of the conviction. He was is associated with triggering the shooting at the Carroll County Courthouse in Hillsville, Virginia on March 14, 1912, in which five people were killed and seven wounded. |
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Anna Marie Hahn (July 7, 1906 - December 7, 1938), known as "Arsenic Anna", was the first woman to die in the electric chair in Ohio and America's first female serial killer to die in the chair. She was executed for the murder of 73-year-old Jacob Wagner of Cincinnati in 1937. Hahn, an immigrant from Bavaria, was suspected in numerous other poisoning deaths.
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