Right. Hank Thompson is connected with many "firsts" in MLB:
Youngest African-American to integrate a team
First time two African-American teammates played on the same team in the same lineup (with Willard Brown) (at least the first since the Walker brothers in the 19th century)
First time African-American players appeared in the same game on opposing teams (against Larry Doby)
First African-American player to appear in both American and National Leagues
First African-American player to bat against an African-American pitcher (Don Newcombe)
Part of first all-African-American outfield (with Monte Irvin and Willie Mays)
A tragic life after baseball, dying at the age of 43.
As always, a great obit on SABR
https://sabr.org/bioproj/person/8740c8c4