Money and immigrants arouse security concerns Early last month, a former top government lawyer got an especially warm greeting from a Senate panel considering a major overhaul of immigration laws. He was introduced as a "highly respected" expert whose insights were valued. That May 2 appearance by Paul W. Virtue, former chief counsel of the U.S. Immigration and Naturalization Service, was one of many he has made since leaving the agency, where he worked for 16 years, ending in 1999. Virtue, a partner in a top Washington law firm, also has made frequent appearances on national radio and television programs...