The Biden administration has made cracking down on anti-competitive activity a cornerstone of its domestic economic agenda. | Drew Angerer/Getty Images The Justice Department is gearing up to challenge what it says is collusive conduct in the rental housing market with a lawsuit against a software company that it believes allows large landlords to fix prices. The DOJ is planning to sue RealPage Inc., a software company used by landlords across the country, according to two people with knowledge ...