variety.com : Owen Gleiberman Chief Film CriticIn one of the hardest sequences to look at in “From Where They Stood” (it’s also one of the hardest to look away from), we see four photographs taken inside the Buchenwald concentration camp by Alberto Errera, a Jew from Greece who was a member of the Sonderkommando — the inmates who were allowed to live, at least for a time, because they agreed to be part of the grisliest work detail. There has never been a known photograph that exists of what went on inside the gas chambers. But Errera came close by...