As a profession, bounty hunting was organized and regulated by various guilds, such as the Bounty Hunters' Guild. Bounty hunters occasionally formed partnerships, though partnering with a fellow bounty hunter could be very dangerous business, as they typically valued their personal gain—and survival—above that of their companions. Despite their political neutrality and independence, many bounty hunters were effective "Jedi killers", which made their services desirable to the Galactic Empire. There were often rivalries between bounty hunters and smugglers serving the same clients, notably between Boba Fett and Han Solo.