Turk was in private practice in Radford, Virginia from 1952 to 1972, mostly with the firm of Dalton, Poff & Turk. Voters in Franklin, Montomery and Roanoke Counties and the city of Radford elected Turk to represent them in the Virginia State Senate in November 1959. He served until 1972, and was minority leader from 1965 to 1972. However, his district's boundaries and number changed drastically, both as a result of the Massive Resistance controversy engulfing Virginia, as well as reapportionments necessitated by census changes, the Voting Rights Act of 1965 and U.S. Supreme Court decisions. Turk initially replaced fellow Republican Ted Dalton who had represented the same 21st district, and who had become U.S. District Judge for the Western District of Virginia. Turk also followed Dalton's footsteps in helping to end Massive Resistance and the domination of the Byrd Organization. For the 1963 elections, the district covering the same counties and city was renamed the 20th, and the 21st became what had been the 22nd. The restructuring in the 1965 elections was major: Montgomery and Franklin Counties and the city of Radford were now joined as the 13th district with Carroll and Floyd Counties and the city of Galax. Restructuring after the 1970 census also proved major: Turk was elected from the 37th district, which included the cities of Radford and Galax, as well as Carroll, Floyd, Grayson and Montgomery Counties. Upon Turk's resignation upon becoming a federal judge, as discussed below, John N. Dalton replaced him.
Federal judicial service
On September 25, 1972, President Richard Nixon nominated Turk to a seat on the United States District Court for the Western District of Virginia vacated by Judge Hiram Emory Widener Jr. The United States Senate confirmed him on October 12, 1972, and he received his commission on October 17, 1972. Turk served as Chief Judge from 1973 to 1993, and assumed senior status on November 1, 2002, after nearly three decades on the bench. He nonetheless continued to hear many cases, stating in May that he was planning to reduce his workload in November. Perhaps his highest profile case involved Rev. Jerry Falwell and Hustler magazine publisher Larry Flynt. Observers noted that his courtesy and folksy demeanor sometimes caused underestimation of his sharp legal mind. Judge Turk's humility was also shown by his practice of always taking a trash bag on his neighborhood walks, in order to clean up after others.
Death and legacy
Turk died on July 6, 2014, in Radford, survived by his wife, five children and many grandchildren. His eldest son Jimmy is a criminal defense attorney in Montgomery County, and his son Bobby Turk became a Montgomery County judge in 2000.