Question: Mike Clancy and Freddie Blassie both won championships in what professional wrestling group?
Sentence (from "Mike Clancy"): Clancy became a prominent performer throughout the National Wrestling Alliance from 1948 to 1967, capturing the NWA World Junior Heavyweight Championship and having feuds with Lou Thesz, Verne Gagne and Freddie Blassie.
Relevant evidence: Yes