CHARLOTTESVILLE, Va. — A car plowed into a crowd of people peacefully protesting a white nationalist rally Saturday in a Virginia college town, killing one person, hurting dozens more and ratcheting up tension in an increasingly violent confrontation.A helicopter crash that killed the pilot and a passenger later in the afternoon outside Charlottesville also was linked to the rally by State Police, though officials did not elaborate on how the crash was connected.The chaos boiled over at what is believed to be the largest group of white nationalists to come together in a decade: the governor declared a state of emergency, police dressed in riot gear ordered people out and helicopters circled overhead. The group had gathered to protest plans to remove a statue of the Confederate Gen. Robert E. Lee, and others who arrived to protest the racism.Matt Korbon, a 22-year-old University of Virginia student, said several hundred counter-protesters were marching when "suddenly there was just this tire screeching sound." A silver Dodge Challenger smashed into another car, then backed up, barreling through "a sea of people."The impact hurled people into the air.