The Black Hebrew Israelites have been labeled a hate group. The suspect wrote anti-Semitic and anti-police posts, an official said. An assailant involved in the prolonged firefight in Jersey City, N.J., that left six people dead, including one police officer, was linked on Wednesday to the Black Hebrew Israelite movement, which has been designated a hate group, and had published anti-Semitic posts online, a law enforcement official said. The violent rampage on Tuesday took place largely at a kosher supermarket where three bystanders were killed. The authorities now believe that the store was specifically targeted by the assailants. The law...