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In Iran, the Islamic Revolutionary Guard Corps is a byword for brutality, charged with defending the regime and cracking down on dissent.
Meanwhile, western nations accuse the IRGC of sponsoring terrorism abroad.
On Monday, Prime Minister Keir Starmer announced that it will be formally designated a threat to national security under a new law.
But Channel 4 News can reveal that former senior members of the IRGC and the affiliated Basij paramilitary group are living in the UK, despite courts finding that they were complicit in crimes against humanity.
