George Clooney’s Powerful Pen

When “ER” star George Clooney heard that “TV Guide” hadn’t yet featured any of his African-American co-stars on their cover, he organized his cast mates to boycott the magazine.

The medical drama “ER” is featured on the Pioneers of Television: Doctors and Nurses episode, premiering Tuesday, April 22, 2014 at 8PM on PBS.