ACLU says ‘Joe Arpaio has proved that he tramples on the US constitution’ after sheriff voluntarily closes his criminal employment squadAn Arizona sheriff known for crackdowns on people living in the country without papers is giving up his last major foothold in immigration enforcement efforts that won him popularity among voters but gradually were reined in by Washington and the courts.Maricopa County Sheriff Joe Arpaio’s office revealed late Wednesday that it was agreeing to disband a controversial squad that has raided businesses to arrest more than 700 migrants who were charged with using fake or stolen IDs to get jobs.