George Metesky
George Peter Metesky , better known as the Mad Bomber, terrorized New York City foryears in the 1940s and 1950s with explosives that he planted in theaters, terminals, libraries, and offices. Bombs were left in phone booths, storage lockers, and restrooms in public buildings, including Grand Central Terminal, Pennsylvania Station, Radio City Music Hall, the New York Public Library, the Port Authority Bus Terminal and the RCA Building, and in the New York City Subway. Metesky also bombed movie theaters, where he cut into seat upholstery and slipped his explosive devices inside.
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Source: Wikipedia