The shorthand title was the trade union royal commission – and the highest-profile targets were a former Labor prime minister, Julia Gillard, and the then Labor leader, Bill Shorten. And everybody knew it. Undaunted by the howls of foul play from the opposition and the criticism of commentators, then Liberal prime minister Tony Abbott had high praise for the man he hand-picked for the job six years ago, former High Court judge Dyson Heydon.