http://www.findjustice.com/nfl/indextext.html
"Black Coaches in the National Football League"
This report led to the creation of the NFL's current policy of inclusion of minority candidates in the interviewing processes of NFL clubs.
For the record, Frederick Douglass "Fritz" Pollard was named a head coach in 1921 in the APFA, which became the NFL a year later. Art Shell was the first African American head coach in the NFL's modern era (1989).
Both men are brothers of Alpha Phi Alpha Fraternity, Inc.