 If you liked
Akumetsu
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 ...then you might like
Brutal: Satsujin Keisatsukan no Kokuhaku
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These two manga are about heavy crimes done by people who think they can't be harmed with the exceptional power and influence they have, and a character who either stays behind the scenes or is taking the spotlight with a disguise, to punish these evildoers.
*Both of them are not for the faint of heart! Be aware: they are extremely violent.
<> Akumetsu: MC is not as sadistic as Brutal's MC. (Both are still about vengeance for the people they committed crimes against)