The mercenary aliens in "The Fifth Element" are described as having been persecuted by the government. JEAN-BAPTISTE EMMANUAL ZORG (head bad guy): "So what if the federal government scattered your people to the winds..." They are referred to as Mandalores by a federal general who is listening to the broadcast of the fight aboard the luxury liner.
Mandalore is the name of the planet and people of which Boba Fett is one. The Mandalorians are mercenaries who were made withouthome by the Galactic Empire which turned Mandalore into a conscription planet. They fight against the empire.
Contributed by Matt