How to evict this tenant? -Las Vegas

[Nat C.]

I bought a 4-plex in Clarke County, Las Vegas just over a month ago. There were 3 units occupied when I bought it.
2 of the tenants are fantastic and paid rent immediately. The third is an incredibly rude, arrogant couple who refuse to pay rent and refuse to leave.
These people have no lease with me and as far as I'm concerned they are squatters. Am I able to remove their stuff and change the locks or do I still need to go through formal proceedings to go through the court and get an eviction order?

[Phillip Dwyer]

@Nat C. You can't let their rude behavior keep you from evaluating all of your options. This is business, don't let it get personal.