GREELEY, Colo. -- Tuesday's arrests at the Swift Plant in Greeley once again highlight the immigration problem plaguing Colorado.

According to Immigration and Customs Enforcement officials, two Swift & Company supervisors were arrested earlier this week at the plant, one on suspicion of being in the U.S. illegally.

The arrests come on the heels of a major raid in December at the beef and pork processing plant. That raid seven months ago remains the talk of the town in Greeley and a major point of contention for those who believe the raid destroyed hardworking families.

About 30 people gathered at the federal complex in downtown Denver on Thursday to protest the seven immigration raids that have taken place in Colorado over the past six months. They believe that the raids destroy families and violate civil liberties.

"I mean, these raids are a concentrated attack on communities throughout the state of Colorado. They're tearing families apart, and it's neither a reasonable or humane tactic for dealing with a very broken immigration system," said one raid protester.

But, while some in Greeley see the impact of the raid as negative, many view the roundup as largely positive.

"We either have a lawful society or we have a lawless society," said raid supporter Frosty Wooldridge.

Wooldridge has authored seven books and believes interior enforcement is key to controlling illegal immigration.

"And today we have a new 21st century slave class in these illegal aliens working up in Greeley and throughout the state. And it's time we get back to integrity and the honesty that built this nation," said Wooldridge.

Greeley Mayor Tom Selders has been outspoken about the timing and the method of the December raid. He said he is disappointed that efforts to reform immigration laws recently failed in Washington, D.C.

However, Selders also said he believes ICE's job is to uphold the law, and he said they seem to be doing that.