A lightning rod for controversy
Arpaio has made national headlines for years with his unorthodox -- and often controversial -- style of justice. And he has been the object of threats before.
Since August 2011, nine threats have been directed at Arpaio that were were credible enough to be investigated. There has been at least one arrest in the past involving threats.
While Arpaio already has reasonable security, Allen said, "we are going to have to augment" it either by getting more personnel or adding electronic security.
Arpaio has housed thousands of inmates in tents and forced all inmates to wear pink underwear. He has boasted about feeding each inmate on less than $1 a day.
His critics say he has a long history of launching bogus criminal investigations against political opponents and anyone else who gets in his way.
He was the subject of a civil lawsuit by the Justice Department alleging civil rights violations. According to the complaint, the sheriff's office has displayed a pattern of discrimination against Latinos that includes racial profiling, unlawful detention and searches, and unlawful targeting of Latinos during raids.
Arpaio has denied any discrimination, and one of his attorneys called the Justice Department investigation a "witch hunt."
His office website touts his "get tough" policies and says his chain gangs contribute thousands of dollars of free labor to the community. Male chain gangs, as well as the world's first-ever female and juvenile chain gangs, clean streets, paint over graffiti and bury the indigent in the county cemetery.
After winning his sixth term last November, the 80-year-old sheriff said he doesn't plan on leaving office anytime soon.
"For my critics out there, I'm going to say right now: In January, I'm signing up for 2016. So I'm not a lame duck," he told a crowd of cheering supporters.