About the film
4 Clowns is a 1970 documentary compilation film written and directed by Robert Youngson that studies the golden age of comedy through a compilation of rare silent film footage of the works of Stan Laurel, Oliver Hardy, Charley Chase and Buster Keaton. It was the last feature film project of producer, director, and writer Robert Youngson.
From the film's Wikipedia article (CC BY-SA 4.0).