The anticipated release of the files by Portland attorney Kelly Clark will reveal 20,000 pages of documents the Scouts kept on men inside - and in some cases outside - the organisation believed to have committed acts of abuse.

The court-ordered release of the so-called perversion files from 1965 to 1985 has prompted the organisation to pledge that they will go back into the files and report any offenders who may have not been reported to the police when alleged abuse took place.

That could prompt a new round of criminal prosecutions for offenders who have so far escaped justice.

The Scouts have, until now, argued they did all they could to prevent sex abuse within their ranks by spending a century tracking paedophiles and using those records to keep known sex offenders out of their organisation.

The Scouts began keeping the files shortly after their creation in 1910, when paedophilia was largely a crime dealt with privately. The organisation argues that the files helped them track offenders and protect children. But some of the files released in 1991, detailing cases from 1971 to 1991, showed repeated instances of Scouts leaders failing to disclose sex abuse to authorities, even when they had a confession.

A lawsuit culminated in April 2010 with the jury ruling the BSA had failed to protect the plaintiff from a paedophile assistant Scoutmaster in the 1980s, even though that man had previously admitted molesting Scouts. The jury awarded $20 million to the plaintiff.

Files kept before 1971 remained secret, until a judge ruled - and the Oregon Supreme Court agreed - that they should be released.