The reason I put "rumored" in quotes was because that's what those who did not believe the reports called them.
But even the most pro German types, like Joe Kennedy, were not allowed anywhere near the camps to do a real "report".
Although aerial photos showed something was there, it was good while before they figured out what all the chimneys were for. The photo interpreters thought it was a slave labor camp, and the ovens were part of the industrial side of it. Wrong! Well not completely wrong. It was an industrial operation in the same way a slaughterhouse is.
I just don’t care about these people.
As to the death camps they were real. There were reports not just rumors. Reports by other than liberal dipshits too. Believable reports.