MINISTERS should order a public inquiry into police collusion with construction industry blacklisting, trade unionists demanded yesterday, as new evidence related to the 30-year scandal emerged.

The official undercover policing inquiry recently disclosed that one former officer with the cover name “Dick Epps,” who spied on left-wing campaigns from 1969-1972, went on to work in the Metropolitan Police’s industrial intelligence section.

A government raid in 2009 revealed that thousands of construction workers had been blacklisted by a cartel of Britain’s largest building firms for their trade union activities.