Know your enemy
As regular readers will know, one of my hobbies is trying to follow the convoluted splits and mergers of British Trotskyism. One of the best pamphlets on this subject is "As Soon as this Pub Closes". I was unaware until a commenter on Dave Osler's blog posted a link to it that it's online here:
It's out of date but provides a useful guide to the political antecedents of some of the current groups.
To map the groups described across to their current incarnations for the benefit of younger readers:
Militant is now the Socialist Party (in England & Wales) and the SSP plus Sheridan's Solidarity in Scotland.
The SWP is still the SWP but now has Respect as a broader front group.
Socialist Organiser is now the Alliance for Workers Liberty.
Socialist Action & the IMG now run London through the employment of leading members by Mayor Ken.
Red Action is now the Independent Working Class Association (IWCA), the Hackney branch of which split off to become "Hackney Independent".