https://en.m.wikipedia.org/wiki/Ron_Stallworth
Ron Stallworth (born June 18, 1953) is an American retired police officer who infiltrated the ranks of the KKK in Colorado Springs, Colorado in the late 1970s. He was the first African-American police officer and detective in the Colorado Springs Police Department.[1][2]The 2018 film BlacKkKlansman is based on his life and early career.