1950 AAFC dispersal draft
On December 9, 1949, the National Football League absorbed three teams from the All-America Football Conference (Cleveland Browns, San Francisco 49ers, Baltimore Colts). The NFL held a dispersal draft on June 2, 1950 for players from the All-America Football Conference teams of the New York Yankees, Buffalo Bills, Chicago Hornets, and Los Angeles Dons.
Source: Wikipedia — 1950 AAFC dispersal draft (CC BY-SA 4.0)