John Mark Slack Jr. was an American politician from West Virginia. He was a Democrat.
Slack was born in Charleston, where he attended the public schools. He later studied at the Virginia Military Institute in Lexington, Virginia. Wikipedia
Born: March 18, 1915, Charleston, WV
Died: March 17, 1980 (age 64 years), Alexandria, VA
Party: Democratic Party
Previous offices: Representative (1963–1980) and Representative (1959–1963)
Education: Virginia Military Institute