Cushman & Wakefield was among six large landlords sued by the U.S. Department of Justice over alleged anticompetitive practices in housing rental markets, the DOJ said on Tuesday.

The Justice Department is thrusting the largest rental property managers into the spotlight as it expands a price-fixing lawsuit alleging widespread collusion in the housing rental market. In an amended lawsuit against RealPage Inc.

The DOH had sued property management software company RealPage of letting landlords collude by sharing their pricing information with the company's software, which then recommends rent prices.