Question: Who founded the radio show that The Carter Sisters joined in 1950 ? 
Sentence (from "Anita Carter"): Ina Anita Carter (March 31, 1933 – July 29, 1999), the youngest daughter of Ezra and Mother Maybelle Carter, was a versatile American singer who experimented with several different types of music and played upright bass with her sisters Helen Carter and June Carter Cash as The Carter Sisters.
Relevant evidence: Yes