Immigrations and Customs Enforcement has been given a broad mandate to round up undocumented immigrants. The agency is infamously unwelcoming to journalists, but two filmmakers managed to get unprecedented access to its employees and detention facilities. Christina Clusiau and Shaul Schwarz discuss how they got this closeup look at the agency as it developed ever-harsher policies designed to deter immigrants. Schwarz tells Jonathan Blitzer, who covers immigration for the magazine, that “if [ICE] can make life difficult enough, if [it] can send these messages . . . that this is the hell you’re going to get, then [they’ll] make these people leave.”  

The documentary, “Immigration Nation,” is available on Netflix.