Before the modern era where did people go to report crimes? Who were their 'police' basically?

It's not a specific question because I want answers for every culture and society!

Like, in fantasy novels, there's always a city-watch that functions like a modern police force - did those exist?

Let's say I wanted to report a theft (with no suspect in mind) - did I go to the city guard/watch, or to a local magistrate?

If I wanted to accuse someone of a crime where did I head?

Whose burden was it collect evidence, the person being accused, or the person accusing, or both?