In response to a Freedom of Information Act (FOIA) request, the Department of State produced 25 documents containing information about Haitian nationals who had attempted to immigrate illegally to the United States and were involuntarily returned to Haiti. Names of individual Haitians had been deleted from 17 of the documents. The question presented is whether these deletions were authorized by FOIA Exemption 6, which provides that FOIA disclosure requirements do not apply to "personnel and medical files and similar files the disclosure of which would constitute a clearly unwarranted invasion of personal privacy." 5 U. S. C. § 552(b)(6).