Claim: Checker Records, founded in 1952 by Leonard Chess and Phil Chess, is an inactive record label located in Chicago, Illinois.
Evidence: Checker Records is an inactive record label that was started in 1952 as a subsidiary of Chess Records in Chicago, Illinois. The label was founded by the Chess brothers, Leonard and Phil, who ran the label until they sold it to General Recorded Tape (GRT) in 1969, shortly before Leonard's death. 
1952 (1952) Leonard Chess
Phil Chess Inactive Chicago, Illinois