The fourth Star Wars: The Old Republic timeline video details the return of the Mandalorians, which were a warlike, nomadic group of clan-based people with members from multiple species.
Mandalorians made great mercenaries and bounty hunters – think Jango Fett.
Though unproven, as no evidence exists, Imperial agents played a role in the Mandalorian rise to power and support of the Empire.
Cool stuff. Hit the link to find out more.