Conversation so far:
What was the controversy in the smothers borthers comedy hour show about?
The brothers soon found themselves in regular conflict with CBS's network censors
Why was there conflict with the censors and the smothers borthers?
the network ordered that the Smothers deliver their shows finished and ready to air ten days before airdate so that the censors could edit the shows as necessary.
Are there any other interesting aspects about the smothers brothers article?
Despite the conflict, the show was picked up for the 1969-70 season on March 14. However, network CEO and President William S. Paley abruptly canceled the show

Question: When was the show cancelled?
Self-contained rewrite: When was the smothers brothers comedy hour  show cancelled by CEO and President William S. Paley?