U.S. PIRG, the United States Public Interest Research Group, is a state-based, citizen-funded advocacy group that promotes the public interest. U.S. PIRG, the United States Public Interest Research Group, is a citizen-funded advocacy group that U.S. PIRG is a federation of independent, state-based, citizen-funded Public Interest Research Groups in 25 states, whose role is to find common ground around the commonsense solutions that will make our future healthier, safer and more secure.