A Los Angeles labor leader now the target of a corruption probe routinely ordered employees of a charity he headed to work on campaigns for political candidates -- a practice barred by law -- according to people who said they participated in such activities. Tyrone Freeman, president of the Service Employees International Union's largest California local, later denied to the Internal Revenue Service that the charity employees were required to do campaign work, said a person close to an IRS inquiry into the matter. Because they are subsidized by taxpayers, charities are forbidden to take part in campaigns for public...