Here are some links:
https://www.independent.co.uk/voices/comment/pie-controversy-harriet-harman-has-got-this-one-wrong-9162728.html
https://www.theguardian.com/politics/2014/mar/02/how-paedophiles-infiltrated-the-left-harriet-harman-patricia-hewitt
And this telling paragraphs from wikipedia:
Whilst PIE was affiliated with it, the National Council for Civil Liberties (now Liberty) argued that photographs of undressed children should not be considered "indecent" – and therefore illegal – unless it could be proven that the subject had suffered harm, or an inference to that effect could reasonably be drawn from the images. A document penned on the organisation's behalf by Harriet Harman (later deputy leader of the Labour Party), working as a legal officer at the time, placed the onus of proving harm on prosecutors and warned of the dangers of increasing censorship, although it did also argue that "it is none-the-less justifiable to restrain activities by photographer[s] which involve placing children under the age of 14 (or, arguably, 16) in sexual situations".[48] The issue of PIE's connection to the NCCL was controversial internally, with union affiliates lukewarm. At the spring 1977 NCCL conference, then general secretary Patricia Hewitt said that "public hostility to paedophilia was such that it damaged the cause of gay rights for the gay movement to be associated with it".[49]
In May 1978, according to Magpie, NCCL motions were passed supporting PIE's rights and the annual meeting went on to condemn 'attacks' against paedophiles and their supporters, saying "this AGM condemns the physical and other attacks on those who have discussed or attempted to discuss paedophilia, and reaffirms the NCCL's condemnation of harassment and unlawful attacks on such persons."[8] A spokesperson for Harman said: "PIE had been excluded from the NCCL before she became legal officer." However, press cuttings from 1983 make it clear that it was still considered an "affiliate group", according to The Daily Telegraph.[50] In August 1983, a Scotland Yard report on the activities of PIE was being sent to the Director of Public Prosecutions, following the 1981 arrest of Tom O'Carroll.[51]
In February 2014, Shami Chakrabarti, the director of Liberty, issued an apology for the previous links between the NCCL, as Liberty was then known, and PIE. She said: "It is a source of continuing disgust and horror that even the NCCL had to expel paedophiles from its ranks in 1983 after infiltration at some point in the seventies."[52]
https://en.wikipedia.org/wiki/Paedophile_Information_Exchange
Also at that time NCCL advised politicians that it would be against men's human rights to fund women only groups. Sound familiar.