Factions get a 3 month gap in which they are allowed to exist - in reality it's much less as the practical work takes times and can be hindered by the actions of the centre in terms of distribution of material, access to members (and and they need at least 30 members prepared to face the CCs wrath) and so on - no to mention that if you
uncovered trying to make the tiniest of (trotsky-fascist no doubt!) plans to even talk about factions outside of this period then you - as the facebook four found out - are out on your ear pronto. Slates can be proposed at conference by any delegate with the support of five total - they don't necessarily have to be tied to a faction. The SWP constitution as adopted in 2009 after
very deep revision and scrutiny is
here.