...The case, Ziglar v. Abbasi, arises out of the roundup of hundreds of immigrants in the months following the Sept. 11, 2001, attacks. Federal officials arrested more than 750 men from South Asian and Middle Eastern countries, often based on nothing more than vague tips from members of the public reporting “suspicious Arabs” in their neighborhoods. One man came to the FBI’s attention when his landlord called to say that she would “feel awful” if her Middle Eastern tenants were involved in terrorism and she hadn’t called. Another immigrant was detained after someone reported that the grocery store where he and other Middle Eastern men worked employed “too many people to run a small store.” ...

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