The House I Live In (1945) [HD] Frank Sinatra film

Sinatra, apparently playing himself, takes a break from a recording session and steps outside to smoke a cigarette. He sees more than ten boys chasing a dark-haired boy and intervenes, first with dialogue, then with a short speech. His main points are that we are "all" Americans and that one American's blood is as good as another's.
Made to oppose anti-Semitism at the end of World War II, it received an Honorary Academy Award and a special Golden Globe Award in 1946.