Terrorist Bomb Plot Foiled by Postage Due

36 packages of dynamite rigged as bombed were mailed to prominent US officials in April of 1919. Thought to be the work of anarchists although this was never proven. For various reasons none of the people the bombs were addressed to actually reached them.

Author and historian, Tim Weiner, writing in his Pulitzer Prize winning book,  Enemies: a History of the FBI,  says: “A postal clerk in New York found sixteen of them [dynamite bombs] on the postage due shelf; the bombers hadn’t used enough stamps.”