Richard Leonard is backing a move to starve rogue employers of coronavirus financial aid.The MSP has launched a campaign with former shadow chancellor John McDonnell to punish those who abuse workers through zero-hour contracts, avoid tax and pollute the environment.In his first Commons intervention since returning to the back benches, McDonnell will present a Bill at Westminster on Wednesday to set up a Good Business Commission.Leonard, who will lodge a motion at Holyrood to promote the Bill, said: “For too long big firms with the deepest pockets have used loopholes to avoid paying their fair share of taxes while paying their workers poverty wages, all while drawing on public money."He added: "While this legislation is reserved to.