UPA logo, Alvin Lustig, 1950
John Hubley, c.1950
The Rite of Spring, Directed by Bill Roberts & Paul Satterfield, Fantasia, 1940
Black and White, Directed by Ivan Ivanov-Vano, 1933
The forced move resulted in some of the most innovative animation to date as well as some of the most influential animation every created. Their success was not only critical, but popular as well, receiving academy awards for both 1949's "The Ragtime Bear" (featuring Hubley's most well-known creation, a caricature of a McCarthy-ite named Mr. Magoo) as well as 1950's "Gerald McBoing-Boing" (based on a story by Dr. Seuss).
The Ragtime Bear, Directed by John Hubley, 1949
Gerald McBoing-Boing, Directed by Robert Cannon, 1950
UPA logo, Alvin Lustig, 1947
Here, without further ado, is the film in question...
Rooty Toot Toot, Directed by John Hubley, 1951
Unfortunately, UPA crumbled soon after the release of the above short. Hilberman had left early on for NYC, his own firm and mostly advertising shorts before briefly leaving the country and then settling in the San Francisco-Bay Area where he taught at San Francisco State University for a number of years. The increasingly threatening activities of the House Committee on Un-American Actitivies forced many either out of the business or at least temporarily out of Hollywood. Hubley was summoned and refused to name names. By 1952 he was out of UPA, working out of LA for another 3 years, before moving to New York. He continued to work in independent animation until his death in 1977. UPA has continued to operate over the years but is a pale reflection of its former self.
For further reading and insight into some of the ideas behind UPA in its original incarnation, I do recommend this 1980 article on Dave Hilberman.
In 1983, Walt Disney's nephew, Roy Disney, purchased the Lautner-designed UPA building in Burbank, California. He offered significant financial incentives to the occupants at the time to move out immediately. He then completely razed the building. All that survives of the era in the area is The Smoke House restaurant next door built in 1949 and frequented by the UPAers over the years both for their hamburgers and booze. Next time you are in that part of the world, stop in and raise a glass for Hubley, Hilbermann, and Mr. Magoo.