If you'd wandered onto the gaming floor of the Las Vegas Hilton at almost any hour during the early 1970s, there's a good chance you'd have spotted a six-foot, grossly overweight man parked at the roulette table. Elephant-head cane resting beside him, cigar clamped in his mouth, cheap baseball cap sitting awkwardly on a bald head, he'd be losing enormous sums of money with a kind of grim determination. He called the casino floor his “other office,” and he meant it, spending 1

Black-and-white group posing with a Tamla-Motown UK Tour banner listing The Supremes, Smokey Robinson, Martha and the Vandellas.

Johnny Cash didn't just sing about the downtrodden. He showed up for them. From Native American rights to prison reform and disability advocacy, here's the full story of his activism.