LAS VEGAS — On a drive through this desert city, the blight from the housing collapse of eight years ago can be seen on almost every block: Overgrown yards and boarded-up windows identify the foreclosed and abandoned homes that still pockmark southern Nevada.

But not all of the dwellings are empty.

Squatters have descended on every corner of the Las Vegas Valley, taking over empty houses in struggling working-class neighborhoods, in upscale planned communities like Summerlin, and everywhere in between. And they often bring a trail of crime with them.

While some unauthorized tenants are families seeking shelter, police officers here say they are more frequently finding chop shops, drug dealers and counterfeiters operating out of foreclosed homes. One man who the police say was squatting has been charged with murdering a neighbor during a burglary.

Even as construction cranes have returned to the Las Vegas Strip and unemployment here has fallen to single digits, the situation is getting worse: the Las Vegas Metropolitan Police Department has received more calls about squatters each year since it began tracking the problem; there were more than 4,000 complaints last year, up 43 percent from 2014 and more than twice as many as in 2012.