A secret list of more than 300 people who belonged to a network that called publicly for the legalisation of sex with children has been handed to the BBC. A small number of those named on the list may still have contact with children. They were all members of a group called the Paedophile Information Exchange (PIE). The Metropolitan Police had the list for about 20 years from the late 1970s. Most PIE members were based in the UK - but there are also details of people in other parts of western Europe, Australia and the US. The BBC has established that a small number of the men are still alive and may currently be in contact with, or have care of, children through paid work or volunteering. PIE was formed in 1974. Its leaders sought to further their cause by attempting to align themselves with feminist, anti-racist and gay rights movements. It was not an illegal organisation and cost £4 a year to join, and to receive its members' magazine. Over a decade, PIE spokesmen gave interviews to the media arguing that adults and children had a human right to have sex with each other. Four years old, they argued, was an age at which most children could give consent. Records ... for 45% of the people on the list [showed] that half of them had been convicted or cautioned (or had been charged and died before trial) for sexual offences against children. Charges included distributing abuse images, kidnap and rape.