Both John Wick and John Wick Chapter 2 have scenes where a cop shows up in the house of Wick and seems to ignore what happened there. From there, it is possible to establish at least that particular cop knows John Wick and knows of the Continental infrastructure.
However, in the Chapter 2 movie there are several scenes of mercs attacking Wick in the middle of street with several witnesses, and there is no sign of any law enforcement.
In the end of Chapter 2, Winston made it clear that the Continental is powerful enough to fill up a whole park of people.
Are law enforcement agencies aware of the existence of the Continental or even a part of it? Is the lack of police just a detail that no one seemed to care in the movie?