Aussiedlers in Dusseldorf, Hamburg, Cologne and other majority cities. Aussiedlers are of german descent that grew up in Soviet Union, they are part of the Russian OC, but slightly different.
Dusseldorf is the capital of OC in Germany, everyone has something going on in the city. Aussiedler, Russian OC, Albanians, Ndrangheta in narcotics mainly Cocaine, Camorra mainly construction, La Cosa Nostra they have been quite for over a decade but still there, Balkans different nationalities are often violent and do jobs for other OC groups or work for them. Turks have a large presence in the city but I have been told they seem to have decreased in membership and activities this past decade, Yakuza like the Turks have decreased in both but have gone more white collar, Greeks mainly smuggling and fraud, but like the Turkish and Yakuza have also decreased. There are also traveling crime groups that visits that city.
On the town outside Frankfurt, until more details arrive, I suspect the Serbians or Moroccans, those two are major groups in the area and have been known to be violent for half a decade.
Germany is actually a huge melting pot of organized crime. As a whole Germany doesn't have the violent crime reputation for instance the UK or France have, but the sheer amount of shady groups doing business in Germany is staggering.
Sicilian mafia, Ndrangheta and Camorra all have cells in Germany. Lots of low-key operation in the Rhineland and throughout the rest of Germany as well. Restaurants, pizzerias, gelaterias...are all used as fronts.
OC from the former Soviet Union traditionally has a foothold in Germany as well. Russian groups like Tambovskaya and Solntsevskaya are active in Berlin, mostly regarding money laundering. If I'm not mistaken some time ago about 20 Tambovskaya members were arrested in Berlin. Chechen groups have shown up in Berlin as well.
Thüringen on the other hand is a major base of operation for Armenian OC. There've been reports of Georgian, Azerbaijani and Yazidi criminals operating there as well.
Lots of Balkan OC as well. Serbian and Montenegrin groups for instance were among the first foreign organized crime groups to get a foothold in Germany. Serbian/Montenegrin gangs used to be extremely powerful in Frankfurt. Groups originating from the Sandzak had a lot of operations in Baden-Württemberg. "ex-Yugoslavian OC" didn't leave, but is a lot more under the radar these days.
Albanian clans from Kosovo and Northern Albania made quite a few headlines a few years ago. A lot of their activity was/is centered in Hamburg, but for instance Stuttgart was another base of operation.
Germany has a large Turkish population so Turkish OC of course has traditionally been very strong in Germany as well. Plenty of traditional Turkish organized crime in Germany is actually Kurdish. The Baybasin from Diyarbakir for instance trafficked a ton of heroin throughout Germany. The Kitay clan - Zaza Kurds from the Bingöl/Dersim region - were notorious heroin traffickers in the Rhineland as well.
Turkish mobs from the Black Sea region, like for instance the "Oflu clan", traditionally trafficked heroin into Germany as well. Not sure if they still operate a lot in Germany these days.
German-born Turks overwhelmingly have origins in Central Anatolia. They tend to join biker gangs. Hells Angels Turkey for instance seems to be a charter mostly consisting of German-born Turks. Chapter president Neco Arabaci used to control a lot of activity in Cologne before he was exiled to Turkey. They conduct plenty of trafficking in narcotics and prostitution as well. Illicit proceeds are invested in property in several Central Anatolian cities like for instance Kirsehir.
There've been a lot of reports on the "Arab clans" for some time now. This mostly concerns a few large families like Al Zein, Rammo and Miri and their related families like Saado and Fakhro. These are Mhallami/Mardinelli clans who emigrated from Lebanon to a few major German cities: Berlin of course, but also Bremen and several smaller cities in the Ruhr.
Not all of the well known Lebanese clans are "Mardinelli" tho. For instance the Chahrour clan is a large Shi'ite clan originally from Beirut and the Bekaa and they're very strong in Berlin (maybe even on par with Al Zein).
Germany always had one of Europe's strongest biker communities as well. The traditional German Hells Angels have always shared a close cooperation with their counterparts in the Netherlands, Denmark and Sweden. The Hessen/Frankfurt chapter led by Walter Burkhard is reportedly one of the richest HA chapters in Europe. Law enforcement is trying to prohibit a lot of the traditional HA chapters, but they remain active nonetheless.
There's reputed to be a bit of an internal rift between the old school German chapters and the more "Turkish" chapters that report to Neco Arabaci. Make no mistake though, as both sides are very capable and dangerous, but it doesn't seem like they're going to let anything getting in the way of business.
A few other groups are active in Germany as well;
Nigerian groups traffic in cocaine and operate plenty of prostitution rackets.
Greek groups have their gambling and fraud vices on the side.
Moroccan groups are less large scale than they are in the Netherlands and Belgium, but several Moroccan criminals in Germany have family members in the other countries (since most of them have origins in either Nador or in the Tanger-Tetouan-Al Hoceima region in the north of Morocco) so they got plenty of opportunities to traffic in cocaine as well.
Asian OC is very much Vietnamese dominated. Neighboring Czech Republic is ground zero for Vietnamese OC and they operate mainly in cities like Cheb and Varnsdorf which are close to the German border. So a lot of Vietnamese OC boils over from the Czech Republic into Germany.
