Curtis Sliwa is an American activist, radio talk show host, and the founder of the Guardian Angels. He established the non-profit, unarmed crime prevention organization in New York City in 1979 to patrol the subway system. Over the decades, the Guardian Angels expanded into a global volunteer organization with chapters in numerous cities. Sliwa has also maintained a long career in radio and was the Republican nominee for Mayor of New York City in the 2021 election.