Federal investigators are zeroing in on why city officials hired young building inspectors, including the 19-year-old son of a top union official, as the federal Hired Truck probe continues to broaden... Agents want to know what role the Mayor's Office of Intergovernmental Affairs played in getting a job for Andy Ryan, who was hired in 2004 when he was just 19, despite the city requiring all inspectors to have completed a four-year apprenticeship and have two years work experience. Ryan is the son of Tom Ryan, the secretary-treasurer of Carpenters Local 13. The union was Mayor Daley's largest campaign contributor...