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Universal could seldom afford its own stable of stars, and often borrowed talent from other studios, or hired freelance actors. In addition to Stewart and Dietrich, Margaret Sullavan, and Bing Crosby were two of the major names that made a couple of pictures for Universal during this period. Some stars came from radio, including Edgar Bergen, W. C. Fields, and the comedy team of Abbott and Costello (Bud Abbott and Lou Costello). Abbott and Costello's military comedy Buck Privates (1941) gave the former burlesque comedians a national and international profile.

What two performers were known as the team Abbott and Costello?
Bud Abbott and Lou Costello