President Franklin Delano Roosevelt had created the post of civilian aide to the Secretary of War Henry L. Stimson, to speak on behalf of black men in the army.

[6] Joe Louis, then assigned to Fort Riley for basic training, who had known Gibson in Chicago, had intervened on behalf of the OCS candidates.

[8] In December 1946, Gibson was named to President Harry S. Truman's nine-member, civilian commission studying the future of universal military training; he was the panel's only black member.

[3] Gibson became secretary and later president of the International Boxing Club (IBC), which promoted important title fights and arranged national television coverage of the sport during the 1950s.

[5] In 1959, Gibson became one of the three original directors of the Chicago-based National Boxing Enterprises, the company that brought the legendary Friday night fights to television.

Two years later, Gibson and four co-defendants – Frankie Carbo, once described by the New York district attorney's office as "the underworld czar of boxing", Louis Tom Dragna, Joe Sica, and Frank Palermo – were convicted in federal court of conspiracy and extortion in an effort to siphon off earnings from the welterweight champion Don Jordan.

He served on the boards of directors of the Chicago Community Fund and Roosevelt University and remained a member of the Cook County Bar Association.