There are some human experiences which most of us find it very hard to get our heads around. Stephen Sackur speaks to Albert Woodfox, who experienced the unimaginable torment of more than four decades in solitary confinement, in a tiny cell in one of America’s most notorious prisons. He was the victim of ingrained racism and brutality inside America’s system of criminal justice. He is now a free man, but what does freedom really mean, after everything he’s been through?

(Photo: Albert Woodfox, a former member of the Black Panthers, who was put in solitary confinement at the Louisiana State Penitentiary. Credit: Alain Jocard/AFP/Getty Images)