The clansless. Caitiffs, are a new aspect to the vampire's society. They don't have anyone to teach them Disciplines, and no one to tell them of the Traditions. This doesn't mean they don't know any Disciplines, they could very well make their own, but usually they figure out a few small tricks to a few Disciplines. Some may even group together every once in a while, but not likely. They prefer their freedom, and the will to do what they will.
Caitiff are vampires with no clan to call their own. This usually happens because their sire despised them and left them to die. And the occasional victim of feeding gets lucky, and some how gets some of the vampires blood. They are also the rebellious ones, and some take leave of their sire and do as they will, most of the time moving to a new city or some where remote.
Most of the other clans look upon the Caitiff as trash, weak blooded, no knowledge of who and what they are and leave them to them selves as long as they don't cause any trouble, and most defiantly don't break the Masquerade.