Union "animals" threatened to kill a plumber unless he raised his prices, a developer has told the unions royal commission.

But union lawyers responded by saying Melbourne developer Leigh Chiavaroli was looking for a scapegoat after his Pentridge Prison redevelopment stalled. Mr Chiavaroli told the inquiry on Wednesday that Croatian officials from the Construction, Forestry, Mining and Energy Union (CFMEU) threatened plumber Joe Mellino to make him raise his prices…