In 1971 the proprietor of Stage 1 publishers was found guilty of having in his possession obscene books for publication for gain. Richard Handyside was fined £25 on each summons and ordered to pay £110 costs.
The obscene publications were copies of The Little Red Schoolbook written by two Danish schoolteachers, Søren Hansen and Jesper Jensen -- and then rewritten by a group of British adults and schoolchildren, including a young Hilary Benn. It urged young readers to question authority and challenge social conventions, and described adults as 'paper tigers'. Pupils were encouraged to disrupt lessons that they found boring.
The book was widely regarded as an invitation to anarchy, and it was banned in Italy and France. An abridged version was eventually passed for publication in the UK, but it had by this time achieved considerable notoriety. Ironically, the main area of contention was not the political message, but the section giving basic sex education and advice -- particularly concerning masturbation -- most of which would be on the school curriculum these days. This was of course the convenient pretext chosen the DPP in order to suppress a book that they regarded as socially subversive.