Although membership, requirements were much less that similar Trotskyist groups at the time. (Militant wanted 20 papers sold and a 20pc tithe on your earnings), political education went beyond the understanding of most socialists and left within months (I came from a Liberal Party background, and enjoyed the schism histories of Left Politics, but just couldn't understand finer points of the nature of the Soviet Union; Militant gave me a 30 minute lecture on the break up of the Soviet Union and a disco)
This does not stop the rightwing in NUS treating Socialist Organiser (aka "S.O.") as the secret conspiracy behind every setback and every instance of opposition they face. The supposed organisation is supposed to have covert arrangements to produce such outcomes, and every left-leaning campaign, however broad-based, is accused of being a "front" for "S.O.". Basically, the NUS rightwing's pet version of Illuminati, cabal or ZOG.
Also known as 'the trots'.