Jewel-Osco's parent company used "dirty tricks" to stop the construction of a rival Walmart store and other retailers in Mundelein, according to a newly filed lawsuit. The Rubloff Development Group, which headed the long-stalled plan to build the Mundelein Town Center shopping center on Route 60 north of Route 176, accused the Supervalu company of hiring a Massachusetts firm called the Saint Consulting Group to "harass and interfere with" the proposed development and a similar plan in suburban New Lenox, the lawsuit reads.