I have sadly missed the Comics Unmasked exhibition at the British Library, which closed on August 19th.
You can gain some insight into what was missed by looking, whilst you can, at the relevant section on the British Library website. There is also a book written to accompany the event, and an excellent summary appeared in the May issue of Fortean Times, courtesy of Paul Gravett.
As a long term observer of that curiously puritanical streak which runs through the British left, I was immediately drawn to this paragraph in Gravett's article:
It’s ironic that the first exhibition devoted to comics was probably the touring display of so-called ‘horror comics’ - imports, reprints and imitations of uncensored American comic books like the notorious Tales from the Crypt - organised by the National Union of Teachers. This display toured the country and was the basis of a film strip projected in schools. While these were intended as part of their campaign to raise alarm about the effects of this shocking material, it probably also gave many youngsters their first exposure to these tempting terrors. Pressures on the government to take action came from many sides, including the unlikely alliance of the Church of England, right up to the Archbishop of Canterbury himself, and the anti-American Communist Party who discreetly ran the Comics Campaign Council. The result in 1955 was the Children and Young Persons (Harmful Publications) Act. Very few prosecutions resulted but it is still in force and the stigma against comics has never entirely gone away.
It is worth re-capping on that. A major trades union, the NUT, the Communist Party of Great Britain and the Church of England all campaigned against the presence in the UK of American comics. And this resulted in legislation being enacted against 'harmful publications'. Legislation that has never been repealed!
Just skimming through the various histories I have on my bookshelf of the CPGB, I cannot find any mention of the Comics Campaign Council as a prominent 'front-group.' Then again sympathetic histories may be very likely to avoid the subject.