Brooklyn Heights resident Ivaylo Ivanov used to like to stay busy. When he wasn't wandering the neighborhood distributing fliers encouraging people to "Kill All Jews" and reminding them that "US hates you," he was spray-painting swastikas on synagogues and tending to his impressive home arsenal. You may recall that police discovered his cache—which included explosives, a semiautomatic handgun, a sniper rifle, machine guns, ammunition, and a pipe bomb hidden in a Nerf football—after Ivanov called them when he shot himself in the hand. Well, Ivanov is going to have to find other ways of passing the time in prison; he finally pleaded guilty to weapons possession and criminal mischief as a hate crime, and faces up to 18 years in prison. Of course, many influential books have been written from behind bars.