Question: What American radio and television Western drama series did John Crawford act in? 
Context: Bonanza is an NBC television western series that ran from 1959 to 1973.  Lasting 14 seasons and 431 episodes, "Bonanza" is NBC's longest-running western, and ranks overall as the second-longest-running western series on U.S. network television (behind CBS's "Gunsmoke"), and within the top 10 longest-running, live-action American series.  The show continues to air in syndication.  The show is set around the 1860s and it centers on the wealthy Cartwright family, who live in the area of Virginia City, Nevada, bordering Lake Tahoe.  The series stars Lorne Greene, Dan Blocker, Michael Landon, Pernell Roberts (who left after six seasons), and later David Canary and Mitch Vogel.  The show is known for presenting moral dilemmas. John Crawford (September 13, 1920 – September 21, 2010) was an American actor.  He appeared in a 1961 episode of "The Twilight Zone", called "A Hundred Yards Over the Rim", and in several "Gunsmoke" episodes.  He had a key role in the 1975 film "Night Moves", a crime thriller starring Gene Hackman, and played the mayor of San Francisco in 1976's "The Enforcer", the third Dirty Harry film featuring Clint Eastwood. Strange Empire is a Canadian television drama series that aired on CBC Television in the 2014–15 television season.  Created by Laurie Finstad-Knizhnik, the series is a serialized Western drama set near the Alberta-Montana border in the 1860s, in which three women band together for survival after the men in their town are murdered. Melanie Scrofano is a Canadian actress.  She is known for playing the roles of Rebecca on the CBC dramedy series "Being Erica", October on the Showcase comedy mockumentary series "Pure Pwnage", and Tia on the CTV Television Network fantasy drama series "The Listener".  Scrofano has played the lead role on Syfy's modern Western drama "Wynonna Earp" since 2016. Lash of the West is an American Western drama series that aired on ABC on Sunday night at 6:30 p.m Eastern time from January 4, 1953 to April 26, 1953.  The series was essentially put together using clips from 1940s B-grade Western movies. Empire Builders is an American old-time radio Western.  It was broadcast on NBC-Blue from January 14, 1929, to June 22, 1931.  The reference book "Radio Rides the Range: A Reference Guide to Western Drama on the Air" commented, "This may have been the first western drama on radio; it certainly was one of the most unique." Johnny Guitar is a 1954 American Trucolor western drama film directed by Nicholas Ray starring Joan Crawford, Sterling Hayden, Mercedes McCambridge, and Scott Brady. Old Oklahoma Plains is a 1952 American Western film directed by William Witney and written by Milton Raison.  The film stars Rex Allen, Slim Pickens, Elaine Edwards, Roy Barcroft, John Crawford and Joel Marston.  The film was released on July 25, 1952, by Republic Pictures. Father Murphy is an American television western drama series that aired on the NBC network from November 3, 1981, to September 18, 1983.  Michael Landon created the series, was the executive producer, and directed the show in partnership with William F. Claxton, Maury Dexter, Victor French and Leo Penn. Gunsmoke is an American radio and television Western drama series created by director Norman Macdonnell and writer John Meston.  The stories take place in and around Dodge City, Kansas, during the settlement of the American West.  The central character is lawman Marshal Matt Dillon, played by William Conrad on radio and James Arness on television.  When aired in the UK, the television series was initially titled Gun Law, later reverting to "Gunsmoke".
Answer: Gunsmoke