One campaigner said he had heard of babies born but never registered, so they would not be missed when killed by secret paedophile networks.
The existence of such terrifying cults is said to have gone unchecked in Scotland for decades, with victims facing scepticism and outright disbelief.
Many incidents took place years ago but experts are sure ritual abuse rings still operate.
Police Scotland said yesterday they were taking the allegations “incredibly seriously” and would investigate any complaints.
The claims will put the Scottish government under intense pressure to announce a public inquiry into historic child sexual abuse, with Scotland now the only part of the UK without such a review.
The disturbing claims of snuff films and widespread ritual abuse made by two charities came to light during a lengthy investigation by the Sunday Express.
Last year we revealed that shamed DJ Jimmy Savile raped a girl aged 15 in 1975 during a satanic abuse ritual, while cloaked paedophiles looked on.
Kate Short, of Kilmarnock-based charity Break The Silence, said: “We have had quite a lot of people who have been abused as part of a cult or a paedophile ring.
“In the worst cases they have been forced to watch the making of snuff movies.
“It’s the extreme, barbaric type of terror that can lead to serious personal disorder.
“Victims are so brainwashed they don’t dare to speak out.”
Charity Izzy’s Promise is based in Dundee.
Project co-ordinator Joseph Lumbasi said: “Babies are aborted for sacrifices.
“There is pornography, sick films.
“Horrific things are happening and nobody is getting caught.”