About the film
10,000 Kids and a Cop is a 1948 documentary short directed by Charles Barton about the philanthropic work of the Lou Costello Jr. Youth Foundation in Los Angeles, California, named after the comedian's son who had died in 1943 aged 1, and it was originally distributed for free to U.S. film exhibitors.
From the film's Wikipedia article (CC BY-SA 4.0).