WASHINGTON – The nation's police chiefs are rising up against another conservative crime-fighting initiative, sending a letter to leaders of Congress on Thursday opposing a bill that would allow gun owners with concealed-carry permits in one state to carry their concealed weapons in all 50 states. The letter from the International Association of Chiefs of Police, representing 18,000 police departments across the United States, and Boston Police Commissioner William Evans targets the "Concealed Carry Reciprocity Act," which passed the House in December and is now assigned to the Senate Judiciary Committee.