Crime in Zurich, Switzerland

Zürich in general is very safe, and is probably one of the safest city in the entire western world. However, whoever thinks this city is crime free is delusional. Zürich is far less safe than let's say, Singapore or Tokyo.
If you are a white male, more so if German speaking, chances are that you can live in Zürich for your entire life without any problem.
Adults in Zürich, black or white, local or foreigner, in general respect laws and you will have no problem with them too.
However, just like anywhere else in Europe, certain second generation immigrants from Middle East and Africa essentially live in parallel societies here. Groups that most likely will create troubles are 12-18 y.o. teenagers with a non-European background. Again, if you are a white male, they won't bother you. But I've witnessed them harassing girls for more than once on public transport late at night. You can't really miss them, as they usually form groups of 3~5, speak in a gangster-ish Züritüütsch dialect and roam around looking for trouble. Just spend some time around Oerlikon Bahnhof at night and you will see a plenty of them.
Overall, I would suggest women against walking around alone at night in certain areas (Oerlikon Station, Schwamendingerplatz, and certain areas in Seebach). Places like Dietikon (technically not in Zürich city) and Langstrasse have a bad reputation, but I personally think the danger is overhyped. Again, if you are male and you insist that Zürich doesn't have any crime problem at all, you are biased because the kind of crimes here don't really involve you. I am male too and while I personally haven't experienced anything bad, I've witnessed quite a few happening to female residents here.

People who think that crime in Zurich is less than other big cities elsewhere, are delusional.
Since the corona crisis things have gone downhill. If you want safety, head for the mountain villages.

Lol at the anonymous that says that the city has no immigrants, while Zurich is one of the city with the highest number of immigrants in the world (more than 1/3 of the total population) as well as all the other big cities in CH

Stay away from groups of people that are obviously not Swiss. The numbers of incidences of those groups viciously attacking people for their phones, money or because they are just bored, have increased dramatically. In the typical Tourist-Areas you wont have any problems.