The Supreme Court refused Monday to block a lawsuit against gun manufacturers accused of negligence for firearms violence in the nation's capital. An appeals court had said the District of Columbia government and individual gun victims — including a man who was left a quadriplegic after being shot in 1997 — could sue under a D.C. law that says gun manufacturers can be held accountable for violence from assault weapons. The high court had been asked over the summer to use the case to strike down the statute, which gun makers said interfered with their right to sell lawful products....