(wapo) In just over a decade, Frederick County has been transformed from a bucolic, timeless community of dairy farms and strawberry festivals to a fast-paced mosaic of high-tech firms and housing developments, Pilates classes and exotic eateries, mega-stores and McDonald's. The changes have also brought thousands of Hispanics, some legal immigrants and others not, who have migrated up Interstate 270 to meet the demand for construction and service jobs. Until now, the county has handled the influx with outreach classes in schools and community policing programs. Chic Hispanic restaurants flourish in downtown Frederick, and working-class Latinos have remained relatively invisible. Suddenly, however, their presence is igniting a controversy that some fear could escalate into the kind of war over illegal immigration that has torn apart Prince William County. In the past month, the Frederick County sheriff has joined with federal authorities to identify and deport illegal immigrants, and county commissioners have proposed legislation to ban free translation of county business and require public schools to track down students who are in the United States illegally. "The single biggest threat to our country is the immigration problem. We cannot continue to absorb this population or we will end up in collapse like a Third World country," said Sheriff Chuck Jenkins, whose officers have identified 18 illegal immigrants in the past two weeks after traffic stops or other incidents. "We are not going out in a white van with a big net, but we are getting the criminal element of the illegal population out of Frederick County." Local opponents of the measures, including black, white and Hispanic residents, say the crackdown and other proposed actions smack of racism and political grandstanding. They say Latinos have been welcomed by Frederick's businesses as a source of cheap labor. Since 1990, the county's Hispanic population has more than tripled, from fewer than 5,000 to more than 15,000, growing to about 5 percent of the county's inhabitants. "This is nothing but scapegoating," said Lydia Espinoza, a community mediator of Mexican American descent. "The immigrant community has been growing here for years, but now people are seeing more Latinos in public, speaking Spanish in stores. They hear about overcrowded houses or issues that can be resolved by the community. Instead, some people are stoking these emotional fires to create group feelings against immigrants."