A congressional panel is calling for an investigation and hearing into reports that applicants for green cards, work visas and other immigration documents were not properly screened against the U.S. terrorist watch list. Employees at the National Benefits Center in Lee's Summit, Mo., said they did not know that a simple key stroke would have allowed them to fully check the background of applicants against the terrorist database, according to the report first published by the Daily Bulletin this past week. That report was based on federal documents obtained by the newspaper and interviews with employees at the Missouri center....