Sometimes, the target of the mob attacks is the police. Sometimes they involve competing militias. (Antifa vs. Proud Boys etc.) Sometimes, they are organized mob violence against innocent bystanders.
It seems like the "new normal" everyone keeps talking about is pretty violent.
Portland has become a battleground between Antifa and the Proud Boys
Antifa members routinely parade around Portland's streets, exercising control over the territory until police disperse them. Of course, they return later. But the Proud Boys have also chosen Portland as a battleground. They routinely caravan through to confront the tolerant left and engage in physical confrontations with Antifa.
Here is how The Center Square described one of these incidents:
A Sunday showdown between anti-fascists and the Proud Boys in Salem turned into a familiar feud between the police and the ski-masked provocateurs who want them abolished.