“In 1971, William Powell published The Anarchist Cookbook, a guide to making bombs and drugs at home. He spent the next four decades fighting to take it out of print,” writes Gabriel Thompson at Harpers:
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In September 10, 1976, during an evening flight from New York to Chicago, a bearded passenger handed a sealed envelope to an attendant. The note began: “One, this plane is hijacked.” In the rest of the letter, the passenger, a Croatian nationalist named Zvonko Busic, explained that five bombs had been smuggled onboard, and that a sixth had been placed in locker 5713 at Grand Central Station in Manhattan. Busic added that the pilot should radio the authorities immediately and that further instructions would be found with the bomb in the locker. “[It] can only be activated by pressing the switch to which it is attached,” he added, “but caution is suggested.”
While the captain notified air traffic control, Busic entered the cockpit wearing what looked like three sticks of dynamite attached to a battery.