The Poison Pen Letter: The Early 20th Century's Strangest Crime Wave

"Across the transatlantic world in the early decades of the twentieth century a terrible wave of poison attacks took place, cruelly claiming hordes of human victims. In contrast with the toxic chlorine, phosgene and mustard gases which armies put to such ghastly and inhuman use during the First World War, however, these particular poisons were not delivered via canisters and shells."

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