The Department of Justice on Tuesday sued six of the nation’s largest landlords, accusing them of using a pricing algorithm to improperly work together to raise rents across the country. The lawsuit expands an antitrust complaint the department filed in August that accused property management software-maker RealPage of engaging in illegal price-fixing to reduce competition among landlords

The U.S. Justice Department is suing several large landlords for allegedly coordinating to keep Americans’ rents high.

The U.S. Department of Justice and 10 state attorneys general have ramped up their antitrust lawsuit against RealPage, a property management software compa

The Justice Department is adding six major apartment landlords to its lawsuit against real-estate software company RealPage, expanding the scope of its allegations that the rent-setting algorithm enabled illegal price fixing.

Rents are rising, and in some cases, the Justice Department says it may be illegal.On Tuesday, the DOJ filed an antitrust lawsuit against six major landlords. It accuses them of working together to keep rent prices high.