Fuller was a good friend and associate of Dr. T. R. M. Howard, of Mound Bayou, Mississippi and later Chicago. Howard was a wealthy black entrepreneur and a prominent civil rights leader and mentor to Medgar Evers. Fuller and Howard had probably met because of their mutual involvement in the National Negro Business League. Fuller was president of the organization for several terms in the 1940s and 1950s. He hired Howard to be medical director of Fuller Products and supported his Republican campaign for Congress in 1958.