A few hundred people in Venice protested on Friday against US Ambassador to Italy Tilman Fertitta as he arrived in the lagoon city aboard his superyacht, drawing criticism of President Donald Trump’s policies. Activists also objected to the heightened security measures put in place by local authorities as Venice prepares for one of its most important festivals. Fertitta, a billionaire businessman appointed by Trump, is touring the Italian peninsula aboard his 117-metre (384-foot) yacht,...