WICHITA, Kan. (AP) — The Justice Department under President Barack Obama has taken a harder line against anti-abortion activists accused of trying to block access to clinics, suing at least a half-dozen of them under a federal law that lay mostly dormant during the Bush administration.The law was revived after Obama took office and in the wake of the 2009 slaying of a Kansas abortion provider.Since Obama's inauguration, several federal lawsuits have been filed including one against a woman who blocked a car from entering a clinic in West Palm Beach, Fla., and a Texas man who threw his body across the door of a patient waiting area in San Antonio.During the eight years of George W. Bush's administration, the Justice Department filed only one such lawsuit.