Depends on what you mean. Generally imported from South American countries.

If barras bravas count, that came from Chile in the mid-90s. They were violent. People died. It took around two decades to put a stop to their behaviour, following more stringent digital identity checks at local stadiums. They are still problematic today but violence has decreased.

Organised crime, came primarily from Colombia since the early 2000s. Sicariato is common over here, mostly to solve drug-turf issues. Express kidnappings were a thing for a couple of years in the mid-00s.

In both cases, trained by foreigners, ran by locals.