We’re riding along with some of old time radio’s hardest working cops as we kick off Season 13 of Down These Mean Streets! Sgt. Joe Friday hunts for a hold-up man who resorted to murder in “The Big Smart Guy” from Dragnet (originally aired on NBC on June 8, 1950). In Broadway is My Beat, Det. Danny Clover investigates when a piano player is killed at the keys in an episode known as “The Harry Brett Murder Case” (originally aired on CBS on July 31, 1950). Joel McCrea saddles up to find a murderer in “The Hatchet” from Tales of the Texas Rangers (originally aired on NBC on February 11, 1951). And Lt. Guthrie and Sgt. Grebb track a killer after an argument ends with a knifing in “The Jolted Justice Job Case” from The Line-Up (originally aired on CBS on November 1, 1951).