They have had a civil rights investigation of his department since (at least) 2009, and he has refused to turn over documents, so the DoJ has filed suit against the Maricopa County Sheriff’s Office.

Seeing as how it’s pretty clear that the Sheriff’s office is guilty, Arpaio has campaigned on harassing people on the basis of their ethnicity, one hopes that they get the documents, and an injunction, before Sheriff Joe goes and abuses his power to go Jim Crow on Hispanic voters this year.