Another name for M.Bison the would be world "dictactor" and leader of shadaloo from Street Fighter games.
In Japan, the character was named Vega, derived from the star of the same name. However, during localization of Street Fighter II for the English language market, Capcom's North American branch felt that the name sounded non-threatening to North American audiences for the game's final boss, and was more suitable for the androgynous bullfighter Balrog. At this same time another concern arose that the name of another character, Mike Bison, conceived as a parody of real-life boxer Mike Tyson, would be a legal liability for Capcom. As a result, the characters swapped names, and the game's final boss was dubbed General M. Bison for English language appearances of the character.2
In the context of the western versions, the initial in the name "M. Bison" is given the meaning 'Master' though some games, such as X-Men vs. Street Fighter, Marvel Super Heroes vs. Street Fighter and Street Fighter EX, omit it and simply refer to the character as Bison.
Dictator is now used to avoid any of this confusion.