Are Mexican mafias the most respected and dangerous ?
You mean the cartel! They are some if the most dangerous people on the planet! They'll kill people for no reason at all!
No, I don't think so since I've never even heard of such thing as a Mexican mafia.
I don't think I've ever heard of Mexican mafia. There are Mexican (drug) cartels. Among other countries, there are the Russian Mafia. Maybe there are Mexican mafia, but then they must be doing nothing.