Ares – Mafia
Not really. Ares turns a blind eye to some smuggling in and around Detroit and the Great Lakes so long as the Mafia fucked with the Quebeçois. That hasn't really been an issue in a decade, and Quebec has its own organized crime concerns.
Renraku, MCT, Shiawase – Yakuza
The Four Oyabuns. The Yakuza invested in MCT early on, and so The Four have special influence with the corp and with the Yakuza because they're both and neither. They own 45% of MCT, and there are some gumi that pledge direct allegiance to them, but The Four Oyabun know better than to fuck up their trillion-dollar corp on the penny-ante nonsense of street crime — even if it is "organized" syndicate shit.
Wuxing – Triades
Sometimes. But involving them means getting involved in the conflict between triads that are either aligned with Lung or other parties.
Evo – Vory
Nope. The Vory is one of the major factions always vying for influence with the Russian government and its internal factions, and its biggest competition is Saeder-Krupp
and Evo.
I'd think Aztechnology would use the Mexican Drug Cartels, but Aztechnology pretty much ate all the drug cartels, so all illegal sources of income are now legal and goes in to Aztechnologies pockets.
It didn't eat all the cartels. It
is all the cartels (the non-Ghost Cartels, anyway). It was a money-laundering front that became more profitable than the drug trade (which is saying a lot). It sells all those drugs legally now.
NeoNet and Horizon might also use the Mafia like Ares.
Celedyr has his own gang of English ne'er-do wells, the Knights of Rage, which may also count Darren Villiers among its members. But they don't really bother themselves with the mob.
I can't imagine Lofwyr would use any criminal syndicates for some reason. I guess, he ironically uses Humanis Policlubs.
No, but his brother did back in the 2050s. And then took over some Winternight cells around 2060-61.
The important thing to note is that many of the corps are worth far more than the syndicates combined, so it's only worth using them if it's really worth the corps' time and money. And given the location and circumstances, C.R.E.A.M. Allegiance between corps and syndicates doesn't mean shit.