tomarse la justicia por su mano angolul

take the law into one's own hands▼(punish someone according to one's own idea of justice)
verb
[UK: teɪk ðə lɔː ˈɪn.tə wʌnz əʊn hændz] [US: ˈteɪk ðə ˈlɑː ˌɪn.ˈtuː wʌnz ˈoʊn ˈhændz]