Taliban fighters have been brought to the UK on secret airlift flights following the Afghanistan data breach.
Sex offenders and corrupt individuals have also been granted entrance, despite them being put in prison under Afghanistan's US-led coalition.
It comes after a database was revealed earlier this month, sharing details of 100,000 Afghans who had applied for sanctuary in Britain.
The scheme was created to support those who worked with British forces to flee the Taliban, meaning the leak essentially gave a "kill list" to the vengeful jihadists.
GETTY | People with connections to the Taliban have infiltrated their way into the UK
The breach shows that 18,500 Afghans have already been flown to the UK on taxpayer-funded jets.
They are living in Ministry of Defence (MoD) homes or hotels until permanent residency can be located.
However, tens of thousands will be left behind in Afghanistan at the hands of the Taliban.
A 23-month High Court super-injunction was only lifted this month, preventing reports on the leak and the airlift operation.
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Senior sources said people with Taliban connections infiltrated the evacuation scheme and arrived in the UK.
One Afghan official told The Telegraph: "We had civilians in our office who had clear ties with the Taliban.
"They were taken to Britain and then introduced fighters as family members and brought them to Britain.
"Some people on the evacuation list named people with clear ties to the Taliban and introduced Taliban people as cousins, and they are in Britain."
PA | Some 18,500 Afghans have already been flown over to the UK
Another said: "They are not good for Britain. They were fighting against British forces and killed lots of Britons, but now they are being fed by Britons in London.
"They have British blood on their hands."
It is not known if the Taliban actually has details of the leak; however, one Afghan soldier who fled to the UK believes his brother was gunned down in the street this week because the militant group was aware of his affiliation with Britain.
He said: "If or when the Taliban have this list, then killings will increase - and it will be Britain's fault. There will be many more executions like the one on Monday."