The specifics are really foggy in my head so this is going to be a terrible articulation.
Some group of allies, probably Americans because I live in the U.S.; probably soldiers, maybe high ranking military personnel, maybe even some sort of politician or diplomat sent over to help stabilize the nation, upon seeing the atrocities of a specific concentration camp publicly shames (by that I don't know, maybe speaking in a town square, maybe at a meeting of locals with new occupying forces) the citizens of a/the town nearest the concentration camp. He shames them and is really angry at them, saying something along the lines of "You can smell burning corpses in the air for miles and miles, all of you people knew of this and did nothing".
Googling doesn't help because of the near infinite amount of WW2 stories and it keeps showing Dachau, which is nowhere close to being the story I remember hearing.
Thank you for your comments.
I think you're refering to the scene depicted in the 9th episode of Band of Brothers, were Easy company discovers a concentration camp and force the local townpeoples to clear it, clean up the mess and be witnesses of what the condoned.
I could not find the extract where the people are forced to come to the camp, although the discovery of the camp can be found here (WARNING : graphic and unsettling content) : https://vimeo.com/120597804
The camp was indeed liberated by the Easy company of the 101st Airborne division (among others) on 28th of April, 1945, and the habitants of Landsberg am Lech were indeed made to clean up the camp and bury the dead.