Now what changed them once in power

Peter Mandelson (first Secretary of State and Labour Supremo):
"Mr Mandelson was born into a Labour family - his grandfather was a Labour Cabinet minister Herbert Morrison - but he rebelled and joined the Young Communist League after Labour supported the United States' intervention in Vietnam. It was during this period that he attracted the well-documented attention of the MI5 intelligence service."
BBC Biography
He, along with Clarke and other labour politicians spent time in Cuba in 1978 (see below).
Alistair Darling (Chancellor of the Exchequer):
"Darling attended the University of Aberdeen and earned a Bachelor of Laws. In 1977, Darling was a supporter of the International Marxist Group, part of the Trotskyist Fourth International."
Evening Standard article
Alan Johnson (Home Secretary)
Johnson, currently Home Secretary, is quoted as saying: "I wasn't a Trot," he insists. "I was more CPGB [Communist Party of Great Britain]. I did consider myself to be a Marxist - I read more chapters of Das Kapital than Harold Wilson."
New Statesman biography
John Reid (one time Minister of Defence, Home Secretary and Northern Ireland Secretary):
"I have known John Reid as a Communist, as a member of the Scottish Labour party and now as a general in the New Labour Army. His march across this ideological battlefield has been seamless with not a hint of embarrassment. But John is an able person, one of the most able in New Labour's high command. They put him up to deliver the message. And they are right, he is a very capable, articulate figure," said George Galloway, the Labour MP for Glasgow Kelvin.
Guardian
letter
Bob Ainsworth (Minister of Defence)
"In a number of newspaper stories last week, it was suggested that the latest Defence Secretary, Bob Ainsworth, had been - at the age of 30 - a 'candidate member' of a body called the 'International Marxist Group'. The IMG, originally associated with the prominent student revolutionary Tariq Ali, was a Trotskyist group active in the 1970s and 1980s, whose members at one stage adopted the slogan "Victory to the IRA"."
Daily Mail
Steven Byers
Stephen Byers was once an activist in the Socialist Workers Party.
Charles Clarke (one time Home Secretary and Education Secretary)
"He was educated at Highgate School and later King's College, Cambridge, gaining a BA in maths and economics. Mr Clarke was president of the NUS from 1975 to 1977 before becoming a councillor in Hackney from 1980 to 1986. Interestingly, as a radical Marxist he spent a year in Cuba, organising the 1978 World Youth Festival, which was also attended by future New Labour modernisers Peter Mandelson, Paul Boateng (ex Chief Secretary to the Treasury) and Fiona McTaggart (ex Under Secretary of State)."
Guardian
Profile
Alan Milburn (one time Health Secretary)
Marxist. "He famously worked in a Marxist bookshop in Newcastle formally called Days of Hope".
Charlie Whelan (Ex advisor to Gordon Brown)
Communist party member: "John Reid, David Triesman, Peter Mandelson, Charlie Whelan to name a few - belonged to the Communist Party of Great Britain" Observer article August 2002 - see below.
David Triesman (once General Secretary of Labour Party)
Communist party member.
Gordon Brown:
"While Tony read for the bar, Gordon was doing his doctorate on James Maxton an idealistic Clydeside MP from the Marxist ILP."
BBC Biography
The decision to give Gordon Brown his first and only safe seat, Dunfermline East, was made by two T&G officials: Hugh Wyper, the regional boss and a Communist Party member , Deputy Director of the TUC and KGB agent, Alec Kitson.
Jack Straw (Minister of Justice):
Joined Labour Party at 14!
According to his own letter in the Independent newspaper Jack Straw is a Self avowed stalinist .