What better mentor for a 10-year-old than Charles Manson? Little Billy seeks life advice, and America's most notorious killers are happy to oblige

In the late ’90s, pop-culture historian Bill Geerhart had a little too much time on his hands and a surfeit of stamps. So, for his own entertainment, the then-unemployed thirtysomething launched a letter-writing campaign to some of the most powerful and infamous figures in the country, posing as a curious 10-year-old named Billy.

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