A boarded-up building in a small Chicago suburb has become the front line of a federal immigration crackdown in the nation's third-largest city. The federal immigration processing center in Broadview faces growing concerns that the facility to process arrestees is a de facto detention center plagued by inhumane conditions. Relatives of immigrants, lawyers and activists claim that there are as many as 200 people held there at the same time, some for up to five days with limited access to food and water. Federal authorities have not responded to questions about the center.