McDonald’s Corp (MCD.N), the world’s biggest fast-food chain, was accused of mistreating its employees and dodging taxes on Thursday during a Senate hearing in Brazil, where politicians, union leaders and workers from five continents voiced allegations. McDonald’s has come under increasing scrutiny worldwide for allegations of labor abuses, health and safety violations, plus tax evasion in Europe, and Brazilian Senator Pablo Paim called a hearing to allow both sides to make their cases. McDonald’s deferred comment to its regional operator.