(RNS) — Shortly after the Rev. Paul Joseph Keller, two fellow Catholic priests and a nun were ushered into the Broadview Immigration and Customs Enforcement facility outside Chicago on Thursday (April 2), a guard escorted five immigrant detainees to a space on the other side of a half-door. All were bound with shackles, Keller said. When he asked the guard, who was employed by a private company, if the shackles were necessary, the official apologized, explaining it was the result of being short-staffed. Keller and his colleagues then looked into the eyes of the detainees — some of which, he said, welled with tears — and did what they came to do: lead a brief, 15-minute Holy Thursday service, complete with prayers, Scripture readings and a reflection. As they concluded, one priest was allowed past the door, where he washed the immigrants’ feet, an ancient Christian ritual.…