Simultaneous raids carried out in four Alabama counties Thursday turned up truckloads of explosives and weapons, including 130 grenades, an improvised rocket launcher and 2,500 rounds of ammunition belonging to the small, but mightily armed, Alabama Free Militia. Six alleged members of the Free Militia also were arrested by federal authorities and are being held without bond. Investigators said the DeKalb County-based group had not made any specific threats or devised any plots, but was targeted for swift dismantling because of its heavy firepower. The militia, which called itself the Naval Militia at one point, had enough armament to outfit...