On a sweep of farmland hemmed in by the Mississippi River, where guards on horseback once watched over inmates picking cotton, officials on Wednesday proclaimed a new mission for one of America’s most notorious prisons.

A corner of the sprawling Louisiana State Penitentiary, better known as Angola, will now house “Camp 57,” a federal detention center for migrants deemed the most serious offenders, part of President Donald Trump’s mass deportation campaign.

The administration said the facility would provide about 400 beds and described it as part of a broader endeavor to expand detention capacity. It is one of more than 60 new federal, state and local facilities added to the immigration system this year as Immigration and Customs Enforcement tries to meet a daily arrest quota of 3,000 peo

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