Which nationalities of men have a reputation for being tough/violent and good at the street fights in your country?

From my experience Chechens are on whole other level. If you get into a fist fight with a Chechen guy with you will never win. Even Putin is scared of them and their mafia control most of Moscow nowadays. They are also crazy good fighters, dominating MMA

Which nationalities of men have a reputation for being tough/violent and good at the street fights in your country?
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