Nearly 30 years ago, before San Luis, Ariz., was a town, Elias Bermudez drove around its dirt streets hollering into a bullhorn that was strapped to the roof of his Chevy. Ever since, the name of the ex-convict and former San Luis mayor has become synonymous with protest and activism. The voice of a popular Phoenix radio show program, he has developed a reputation as a leading voice in a series of pro-immigration protests in Phoenix that are growing progressively more massive. One of the first to serve as mayor of San Luis, he is the only mayor to do...