The police watchdog is investigating alleged corruption in the Metropolitan Police, including claims it covered up child sex offences because MPs and police officers were involved.
The Independent Police Complaints Commission is investigating 14 referrals spanning four decades.
It said the claims were of "high-level corruption of the most serious nature".
Peter Saunders, chief executive of the National Association for People Abused in Childhood (Napac), said the corruption allegations could lead to "absolutely massive" revelations.
He said people calling their helpline had made allegations about "high-profile" people, including politicians, for years and that he had wondered "if the truth was ever going to come out".
A potential cover-up linked to "failures to properly investigate child sex abuse offences in south London and further information about criminal allegations against a politician being dropped"
A claim that an investigation into young men being targeted at the Dolphin Square flats in Pimlico, south-west London, was halted because "officers were too near prominent people"
An allegation that a document from the Houses of Parliament was found at a paedophile's address linking "highly-prominent individuals", including MPs and senior police officers, to a paedophile ring but no further action was taken
Alleged alteration of a child sex abuse victim's account to remove the name of a senior politician
Alleged child sex abuse by a senior politician and a subsequent cover-up of the alleged crimes
Claims that a surveillance operation of a child abuse ring was shut down due to "high-profile people being involved"
An allegation that police officers sexually abused a boy and carried out surveillance on him
"Having looked and heard other evidence, spoken to other police officers and those in authority who were stopped from investigating, without question there were repeated attempts, successfully at the time, to stop investigations into prominent people and MPs involved in child abuse," he said.
An allegation that an investigation into a paedophile ring that led to a number of convictions did not take action "in relation to other more prominent individuals"
A claim that a politician spoke to a senior Metropolitan Police officer to demand no action was taken regarding an alleged paedophile ring in Westminster in the 1970s
An allegation that in the late 1970s a surveillance operation that gathered intelligence on a politician being involved in paedophile activities was closed down by a senior Met Police officer
A claim that a dossier of allegations against senior figures and politicians accused of being involved in child abuse was taken by Special Branch officers
Allegations that a senior officer instructed that a sexual abuse investigation should be halted, with the order having come from "up high" in the Met
An alleged conspiracy within the force to prevent a politician suspected of offences from being prosecuted
Child sex abuse allegations against a former senior Met Police officer with other "members of the establishment", including judges, alleged to have been involved. It is claimed no further action was taken
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link to m.bbc.co.uk]
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