California election workers quit as self-appointed observers roam Shasta County office

I would imagine this would qualify as harassment of an election worker if these people are truly just self-appointed, not officially designated observers.

But apparently no one is calling the police?

Someone should observe the observers. Follow them around and stay 6 feet away at all times, furiously taking notes.

You'll either get evidence of election interference or you'll interfere in their interference and stop them.

Win-win.