Board Thread:Questions and Answers/@comment-29675013-20160818055458/@comment-29709325-20160821063424

Interestingly enough, recent events have devastated the numbers of the GLC and in the power vacuum, the Sinestro Corps, their old enemies, seem to have taken up their place. It might not last long, mind, and I wouldn't call the SC a very benevolent organization since they literally rule through terrorism and violence, but Sinestro's ultimate goal is to enforce order in the cosmos, so he certainly is approaching it from a "space police" angle, albeit as an extremist.

There are other "Emotional Spectrum" Corps that might fit the bill depending on how you approach it, though: The Star Sapphires for instance, had at one point (not sure what's up with them as of Rebirth) evolved into an organization devoted to protecting Love throughout the universe as an effort to preserve peace and life etc, and as part of this they would charge in to protect people who were in danger of losing their loved ones to "danger" and arrest any culprits, restrain them, and "rehabilitate" them inside crystal cages back on their home base of Zamaron. They might be considered more in the range of well-intentioned extremists than proper cops, but they definitely pursue criminals and do their version of arresting them, which is why they sprung to mind.

There was also the Indigo Tribe, which actively sought out criminals to convert them to their cause, which by default requires forcing them to feel empathy for their victims using the Indigo Light of Compassion. Again, well-intentioned extremists, they use a form of brainwashing, etc., but the fact that they actively pursue criminals has echoes of police work. They're probably better thought of as vigilantes (probably the same holds true of the Sapphires, really), but...well. They're a pretty well organized group, and massive at that.

Classically though, the Green Lantern Corps is THE DCU Space Police organization prior to the United Planets being a thing. So they were the first that sprung to my mind too :)

The Dark Stars though...I don't think they're in current continuity. It had a similar premise as the GLC though but I think it was only really a thing back in the 1990s or so.