[JURIST] The American Civil Liberties Union (ACLU) [advocacy website] filed [press release] a class action lawsuit [complaint, PDF] on Wednesday in the US District Court for the Southern District of Indiana [official website] challenging a controversial Indiana immigration law [SEA 590 text; JURIST report]. The law, inspired by an Arizona law [SB 1070 text; JURIST news archive], requires individuals to provide proof of their legal status at all times, calls for all public meetings, websites and documents to be in…