Jean Smith is kind of modern day bootlegger, but she doesn’t smuggle liquor—she moves butter.

Routinely crammed in her car is a stockpile of butter imported from Ireland. Whenever Smith leaves her home in Waukesha, Wisconsin, to visit relatives out of state, she’ll stop in Nebraska to load up on blocks of Kerrygold butter, which is banned in the state that calls itself, “America’s Dairyland.”

“Ms. Smith brings back as much Kerrygold butter with her when she visits family in Nebraska,” said a civil lawsuit she and three other butter-lovers filed against Wisconsin in a state court last month. “She keeps large amounts of the butter in her home refrigerator in the hopes that she will have enough to last her until her next out-state trip.”