Conversation so far:
when did Walter Winchell go on television?
1950s
what was Walter Winchell's show called when he goes on television in the 1950s?
His weekly radio broadcast was simulcast on ABC television until he ended that association because of a dispute with ABC executives in 1955.

Question: what was the dispute about?
Self-contained rewrite: what was the dispute between Walter Winchell and ABC executives in 1955 about?