You can read about that at: http://www.archbishopsheencause.org/ .
But back in the 50s' he was a television star. He had a talent for communicating the gospel and the teachings of the Roman Catholic Church in a way that was understandable and entertaining to millions of television viewers.
He was so popular that he was even invited to be the "mystery guest" on and episode of the TV program "What's My Line?"
If he is ever officially declared a saint, he will probably be the only one who had a highly rated television show.
Most likely he will be the only saint to guest on "What's My Line?"
Watch his appearance on the program below.