Robert King was just a teen when he entered Angola Prison in the US state of Louisiana for the very first time. In the early 1970s, he was wrongly accused of murder after an inmate was stabbed to death in his cell block. King says he was an easy target: a member of the Black Panthers who was also young, poor, black and had a police record in a racist justice system.
King's story of the decades he and two fellow prisoners spent in solitary confinement is told in a new comic book. Now a free man, he is campaigning to put an end to a practice that he considers torture.