//Regarding his political affiliations, he was formerly a Maoist and a member of the Socialist Campaign for a Labour Victory, a left-wing pressure group founded by Labour Party members, now known as the Alliance for Workers' Liberty. At Cambridge, Marr says he was a "raving leftie" who handed out copies of Mao Zedong's Little Red Book and he acquired the nickname "Red Andy"//
From Wiki.
And he a man who enjoyed the benefits of a pretty privileged upbringing. Par for the course for the lefties.