They traveled 1,720 miles to work long hours on a dairy farm in western Wisconsin, among people who do not speak their language and in a place where their presence is illegal. Part 3 in our Dairyland Diversity project.

A growing number of Wisconsin dairy farmers are relying on immigrants to milk their cows and keep their farms running smoothly. But experts say farmers are often caught in a “don’t ask, don’t tell” web of federal employment regulations, with a strong incentive to know as little as possible about the legal status of their workers.

DODGEVILLE — Rapid increases in the Latino population of Wisconsin’s rural areas are reshaping work, school and social life, but also are raising concerns that Spanish-speaking immigrants are often isolated and mistrusted, experts and residents said at an event aimed at fostering better connections between newcomers and long-time residents.

Municipal spending and debt both increased in Wisconsin’s biggest cities between 2003 and 2007.

Nearly four in 10 Wisconsin elementary students qualified for free or reduced-price lunch last school year, and the proportion of low-income elementary students has climbed every year of this decade, according to state Department of Public Instruction data analyzed by the Wisconsin Center for Investigative Journalism.

Wisconsin Public Television, a partner with the Wisconsin Center for Investigative Journalism, talks with Wisconsin farmers about the role of Hispanic immigrant workers in the dairy industry, as part of a new investigation launched by the Center.

WATERLOO — Top Wisconsin officials acknowledged Tuesday that Wisconsin dairy farmers increasingly rely upon immigrant workers, including large numbers who may be undocumented — a result of demand for labor and the nation’s porous borders.

Upcoming coverage: Dairy farmers have new incentives to expand. Meanwhile, national estimates indicate that half of the immigrant dairy workers — who make up 40 percent of the dairy work force — lack immigration papers. The Center is collaborating with The Country Today to cover the nexus of dairy and immigration in Wisconsin.