Einsatzgruppen Trial, part of the Nuremburg Trials.
The photo is on the lower right side of the wiki article section labelled - 'Quotes from the Judgement.'
(I included this wiki article in my recent post here on Ben Ferencz, the American lawyer in charge of the Einsatzgruppen Trial, 1947-48).
I'm glad to see that new research is ongoing to uncover more about the the origin and history of this haunting WW2 photo of mass murder.
https://en.wikipedia.org/wiki/Einsatzgruppen_trial
.. (Excerpt) The Einsatzgruppen were SS mobile death squads, operating behind the front line in Nazi-occupied Eastern Europe. From 1941 to 1945, they murdered around 2 million people; 1.3 million Jews, up to 250,000 Romani, and around 500,000 so-called "partisans", people with disabilities, political commissars, Slavs, homosexuals and others.[3][4]
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** Wiki. The Last Jew in Vinnitsa.
The Last Jew in Vinnitsa is a photograph taken during the Holocaust in Ukraine showing an unknown Jewish manprobably on 28 July 1941 in Berdichev and not Vinnitsa[1]about to be shot dead by a member of the Einsatzgruppenpossibly Jakobus Onnen, a member of Einsatzgruppe C, a mobile death squad of the German SS. The victim is kneeling beside a mass grave already containing bodies; behind, a group of SS and Reich Labor Service men watch.[2]
History. The photograph was circulated in 1961 by United Press (UPI) during the trial of Adolf Eichmann.[3] UPI had received it from Al Moss (b. 1910), a Polish Jew who acquired it in May 1945 shortly after he was liberated from Allach concentration camp by the American 3rd Army.[3][4] Moss, living in Chicago in 1961, wanted people "to know what went on in Eichmann's time".[3] The UPI copy was published over a full page of The Forward.[5]...
https://en.wikipedia.org/wiki/The_Last_Jew_in_Vinnitsa