A Trotskyist, Barker was a member of the International Socialism Group in Oxford and Manchester from 1962.
Colin Powell | Colin Farrell | Colin Firth | Travis Barker | Colin Baker | Colin James | Colin Davis | Ronnie Barker | Lex Barker | Elinor Barker | Bob Barker | Mount Barker | Howard Barker | Colin Meloy | Colin McCahon | Colin Friels | Jean-Claude Colin | Colin Wilson | Colin Todd | Colin Dexter | Sue Barker | Mount Barker, South Australia | Colin Mawby | Colin Jackson | Colin Hanks | Colin Blakemore | Clive Barker | Sir Colin Campbell | Ma Barker | Colin Welland |