If a person’s past were another country, Rudy Giuliani, U.S. President Donald Trump’s lawyer, would be refused a visa. It takes effort to recall that Mr Giuliani made his name as the scourge of the New York mafia in the 1980s. Today he is under investigation for money laundering, obstruction of justice, campaign finance and other violations by the same US attorney’s office where he made his name. Mr Giuliani was once a crusader against organised crime and — as mayor of New York — for zero tolerance against the pettier ones. His career is now a byword for the moral descent that characterises public life.