Foremost Farms USA, a cooperative of over 2,000 dairy farmers in several mid-western states, sold its Wisconsin milk processing plants to Dean Foods in 2009. In January 2010, the US Department of Justice and the state attorneys general's office of Wisconsin and Michigan, filed a lawsuit objecting to the purchase and alleged that it created a monopolizing provider. Dean Foods announced it was contesting the complaint. In the first quarter of 2010 the company moved to the Cityplace district of Dallas, Texas. In October 2010, Dean Foods announced it was retiring the Schepps brand for dairy products in the Dallas, Texas area in favor of their Oak Farms brand. The Schepps brand had been in the Dallas market since 1942. In 2011, a class action suit was brought against Deans Foods over health claims made on the packaging of Horizon Organic Milk. In 2012, Dean Foods contributed $253,950 to fund opposition to California's ballot Proposition 37 which would require mandatory labeling of foods containing genetically modified ingredients. Dean Foods spun off WhiteWave Foods, the maker of Horizon Organic and Silk Soymilk, as a standalone company in May 2013. In May 2015 Dean Foods announced that they would introduce a national milk brand, DairyPure, which would appear alongside regional brands, in an attempt to boost sales. In 2017, bettor and stock trader Billy Walters was convicted of insider trading in Dean shares in Federal court. Walters' source of non-public information was company director Thomas C. Davis employing a prepaid cell phone nicknamed "the Batphone" and, sometimes, the code words "Dallas Cowboys" for the company name. The case involved profits or avoided losses of $40 million from 2008 to 2014. The verdict was to be appealed according to Walters' lawyer. Southern Foods Group, LLC d/b/a Dean Foods, and forty-two (42) affiliated companies filed for Chapter 11 bankruptcy in the United States District Court for the Southern District of Texas on November 12, 2019 The company cited their debt and pension obligations as the reason for their bankruptcy filing; they also suggested that they were working with potential buyers for the company's assets. A cited reason for the bankruptcy was changing demand for milk and milk-related products., a potential sale to the cooperative Dairy Farmers of America was mentioned. Dean Foods products include milk, ice cream, dairy products, cheese, juice, and teas. It processes milk in the United States under a number of regional and national brands.