Tim Leary had been free for a couple of years when the feds caught up with him in Afghanistan. He’d broken out of the California state prison where he’d been sent, and knocked around the world for a couple of years looking for a place to stay. He’d even been placed under “revolutionary arrest” by Eldridge Cleaver in Algeria, although not for long.
The United States did not, at that time, have an extradition treaty with Afghanistan, and Leary’s arrest there was as controversial as anything else about the man. He was busted while disembarking from a plane, which according to treaty was supposedly US territory.
They brought him back home and dropped him into solitary at Folsom, in the cell next Charlie Manson. The two did not get along at all, as murderers and pacifists so frequently don’t.