[temporarara]

They definitely have issues with immigrant gangs though, and they are looking for solutions, see for example: https://www.dw.com/en/germany-crime-deportations/a-66467396

There it is said that only a third of the gang members are German citizens. They've got like 100 gangs that matter there, and pretty much all are Turkish (Kurds too, not that specific ethnicities matter too much but the point here is that they are immigrant gangs and they are a direct result of the immigrant policies).