The accident happened Saturday afternoon in the town of Onondaga, in central New York near Syracuse.
State troopers tell The Post-Standard of Syracuse that 55-year-old Philip A. Contos of Parish, New York, was driving a 1983 Harley Davidson with a group of bikers who were protesting helmet laws by not wearing helmets.
Troopers say Contos hit his brakes and the motorcycle fishtailed. The bike spun out of control, and Contos toppled over the handlebars. He was pronounced dead at a hospital.
Troopers say Contos would have likely survived if he had been wearing a helmet.