This Man Dawson

Hired to Kill a Cop (1x23)

Air date: Mar 12, 1960

After an undercover cop working for Dawson is murdered, a tape recorder he was carrying reveals the killer. He in turn is killed by order of his boss, a kingpin in a gambling ring. Dawson tails other members of the gang, but they are able to confound the police with duplicate cars-for a while.