(Undated) -- The city of Central Falls is joining the city of Providence and the state of Rhode Island in a class-action lawsuit challenging a newly-added citizenship question to the U.S. Census. Central Falls joined the suit last week, which is being handled by the New York attorney general's office. There is concern that the citizenship question will lead to illegal immigrants not answering the survey, which could cause a loss of federal funding in communities that don't have an accurate population snapshot.