I thibk nobody can really tell which organized crime is the most powerful or number 1. Because there is to much things we can compare to make a list. Like money, drug distribution, territories, gambling, arm trafficking, involment in politics, the influence in the country etc.

So I think it will be better to make tiers list.

For exemple:

First tier: would be organized crime groups like the mafia, cosa nostra, ndrangheta, jewish mob, mexican cartels, russian bratva and chinese triads.

Second tier: would be japanese yakuza, irish mob, colombian cartels, albanians, italian camorra, hells angels, some nigerians

Third tier: chinese tongs, some nigerians, dominican cartels, biker MC, Yardies

**Some street gangs could be on the list of third tier.
And by the way nigerian crime groups are getting stronger in europe and asia, they can be put in second tier.

*** I domt know if I should put the Yakuza on first tier, since I dont really know their operations and power outside of Japan.