Members of 'Mexican Mafia' already in custody on other charges Law enforcement officers in Arizona say they have broken up an alleged plot to assassinate Maricopa County Sheriff Joe Arpaio, who is at odds with the White House over his investigation of Obama’s birth documentation, with the Department of Justice over his crackdown on illegal aliens, and assorted criminals already in jail. The sheriff’s office said today that three maximum security inmates were arrested for conspiracy to commit murder “stemming from a complex plot” that involved the assassination of the sheriff as well as a plot to murder another inmate....