BlacKkKlansman

A-

Ron Stallworth (John David Washington) is undercover through most of “BlacKkKlansman,” and not just on the job, but in the job and outside of it, too. The real-life Stallworth was the first black police officer, and later the first black detective in Colorado Springs, back in the 1970’s and he really did go undercover to infiltrate the Klu Klux Klan — over the phone. Spike Lee’s film is based on Stallworth’s book tells how Stallworth saw a classified ad, called the Klan, and, with the help of a white partner who was “Stallworth” for the in-person meetings, ended up a member in good standing, having…