Which made it all the more astounding when, a few years after his death in 2007, the truth came out. Starting in the early 1960s, Withers had spent nearly two decades as a paid informant of the F.B.I., feeding its agents information about the activists he photographed. He not only informed; he took requests. At one anti-Vietnam War march, he was asked to photograph all of the 30-odd protesters, taking special care to catch all their faces, and he turned 80 8-by-10 prints over to his F.B.I. contact. On occasion, he sold his work to a local paper, then gave copies to the bureau. His daughter Rosalind, the youngest of his nine children and the one who handles his estate, was blindsided when the news came out via a series of FOIA requests and legal fights undertaken by Marc Perrusquia, a reporter from The Commercial Appeal in Memphis. Perrusquia wrote about Withers and the revelation of his intelligence work in his own book, “A Spy in Canaan,” which was published last year. It’s a smart journalist’s book, crisply marching through Withers’s F.B.I. records and the paper’s battle to pry them out of the government’s grip.

In covering the terrorist attack on a Nairobi hotel that killed at least 21 people by Shahab extremists, The New York Times decided to publish an image of a bullet-riddled body taken by Khalil Senosi. Photo Twitter was outraged, and Poynter wrote about the “hard choice” the NYT made regarding the selection.