More than 200 federal agents are expected to begin fanning out across New Orleans on Wednesday after the Department of Homeland Security announced the start of an immigration crackdown dubbed Operation Catahoula Crunch.

Two labourers stand on the roof of a house in Kenner, outside New Orleans, as US Border Patrol agents clamber up a ladder, getting closer.

The announcement included a list and photos of 10 undocumented immigrants — from Honduras, El Salvador, Guatemala, Jordan, and Vietnam — who the agency said had been arrested for a variety of crimes i...