Putney Swope is a 1969 film written and directed by Robert Downey Sr. and starring Arnold Johnson as Swope. Swope is the only black man on the executive board of an advertising firm, and is accidentally put in charge after the death of the chairman of the board. In particular, following the unexpected death of the chair, the other members of the board believed that each of them, individually, should be elected to the board. However, the bylaws of the corporation prohibit voting for oneself for the chair, so each individual member voted in a secret ballot for the person that no one else would vote for, i.e., Putney Swope.
Renaming the business "Truth and Soul, Inc.", Swope replaces all but one of the white employees and insists they no longer accept business from companies that produce alcohol, war toys, or tobacco. The success of the business draws unwanted attention from the United States Government, which considers it "a threat to the national security."
Ahead of its time? Yup.
WARNING: As qwerty points out in comments:
As someone who loves this film, I want to post a warning: it's very much a product of its time, which means that you may find some of the characterizations to be somewhat racist, sexist, or otherwise bigoted -- because they are.
And if you're ok with all that, you should also check out Downey's other masterpiece, Greaser's Palace.