Cafe Express, a unit of Wendy's International Inc., and a Houston law firm have been sued in Dallas County district court on fraud, unjust enrichment and other allegations on behalf of a group of illegal immigrants. According to the suit, about 100 employees of Cafe Express were affected when the restaurant chain and its law firm allegedly missed a 2001 deadline to file paperwork that could have allowed the employees to become permanent U.S. residents. Among them was the lead plaintiff, Jaime Chavez, a 36-year-old Mexican who worked at a Dallas-area Cafe Express. Cafe Express agreed to help the workers...