Divine Allah sat on a red plastic chair inside a one-room efficiency apartment in Trenton, trying to explain the need for black militarism in one of New Jersey's poorest cities. In a little more than a month since opening a Trenton office, Allah, the party's national youth leader, has met with street gangs, held food drives and traveled to the storm-torn Gulf Coast and clashed with police over alleged harassment. Like its predecessor, the New Black Panthers are no new adversary to law enforcement. The original Oakland-formed Black Panther Party, which died out in the 1970s, rose to fame in...