They're the most visible symbol of what U.S. President Donald Trump pledges will be "the largest mass deportation in history."

They're the armed officers of Immigration and Customs Enforcement (ICE), often masked and unidentified, wearing plain clothes under protective vests, arresting people in towns and cities across the country.

ICE made roughly three times as many arrests from May through July compared with the same period last year, according to the latest government figures obtained through a Freedom of Information request by the Deportation Data Project , led by the University of California Berkeley School of Law.

But those same figures do not show a comparable increase in the number of people with a criminal history getting picked up by ICE. Roughly half of the 61,000 people

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