From NKAA, Notable Kentucky African Americans Database (main entry)

The first Louisville baseball team was the Louisville Falls City, which lasted for one week in 1887. The Louisville Cubs team also existed around the turn of the century (and played part of their games as the Nashville Cubs), and the Louisville White Caps team played in the Negro League in 1930. ("[The] Louisville Black Caps [were] the top semipro Black team in town. The team joined the Negro Southern League in 1929, then evolved into the Louisville White Caps and upgraded to the Negro National League as an associate member the following season." [See the source of the White Caps  information at the Infinite Baseball Card website.]

The team rebranded yet again as the Louisville White Sox for 1931 and became a full member of the Negro National League for what would be its last year of existence. The Louisville White Sox were a team in the Negro National League 1930-1931. The Louisville Black Caps, which also lasted for one year, 1932, were in the Negro Southern League, where they produced a 13-17 record. The sixth team out of Louisville, the Louisville Buckeyes (formerly the Cleveland Buckeyes), lasted one year in Louisville (1949), then returned to Cleveland. The team had an 8-29 record while in Kentucky.

A long-lasting team, the Louisville Black Colonels, existed from the 1930s into the 1950s. Goose Tatum played with the team a couple of years, beginning around 1939, leaving after team owner Leonard Mitchell attacked Tatum, who proceeded to put Mitchell in a headlock. Mitchell began to faint and some of the players had to pry him free from Tatum's grip. Tatum later became a star with the Harlem Globetrotters basketball team.

For more see The Biographical Encyclopedia of the Negro Baseball Leagues, by J. A. Riley; Spinning the Globe, by B. Green; and The Encyclopedia of Negro League Baseball, by T. Loverro.