"In many European countries, the majority of jihadist foreign fighters are former criminals," the report titled 'Criminal Pasts, Terrorist Futures: European Jihadists and the New Crime-Terror Nexus' said.
It has been co-authored by Indian-origin senior researcher Rajan Basra for the London-based International Centre for the Study of Radicalisation and Political Violence (ICSR) at King's College London.
"The profiles and pathways in our database suggest that the jihadist narrative - as articulated by the Islamic State (ISIS) - is surprisingly well-aligned with the personal needs and desires of criminals, and that it can be used to condone as well as curtail the continued involvement in crime," it adds.
The researchers, including Peter R Neumann and Claudia Brunner, also found that jihadists not only condone the use of "ordinary" criminality to raise funds, they have argued that doing so is the ideologically correct way of waging "jihad" in the "lands of war".
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The report profiles 79 European "jihadis" who progressed from petty or violent crime to hardened jihadism on the European continent or the Middle East.
Co-author and ICSR director Neumann also highlighted that many security services still expect radicalised young men to change their behaviour and act "religiously", perhaps by growing a beard or changing their clothing.
For some the pattern is still seen, but in many cases it is not, with several European fighters in the ICSR's database continuing to smoke, drink and even take drugs up until their departure for the so-called Islamic State (ISIS).
"It gives criminals a moral justification for doing what they have always been doing - only now they will go to heaven," Neumann said.
ISIS aims to portray membership as a route to action, adventure, power and the sense of brotherhood desired by frequently vulnerable recruits searching for purpose and belonging.
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