U.S. Agents Arrest Dozens of Fathers in Support CasesBy ROBERT PEAR ASHINGTON, Aug. 16 — Federal agents in 29 states have arrested dozens of fathers who owe millions of dollars of child support, in a nationwide sweep that officials describe as a significant expansion of the federal role. More notable than any one arrest, the officials say, is the message that the Bush administration is sending about its decision to pursue a more aggressive approach by using federal criminal prosecution against people who have repeatedly flouted state court orders. Even though child support collections have increased in recent years, many...