One popular lecturer on line [I won't link because I prefer not to get personal] likes to say that Rav Hutner became Satmar later in life and blamed the Holocaust on the Zionists in his article in the Jewish Observer 1977.
The magic of the internet allowed me to access this seminal article on the Churban [he doesn't like the term "Shoah" and prefers "Churban"]. Here is a direct quote:
"It should be needless to say at this point that since the
churban of European Jewry was a tochacha
phenomenon, an enactment of the admonishment and
rebuke which Klal Yisroel carries upon its shoulders as
an integral part of being the Am Hanivchar - G-d's
chosen ones - we have no right to interpret these
events as any kind of specific punishment for specific
sins. The tochacha is a built-in aspect of the character
of Klal Yisroel until Moshiach comes and is visited
upon Klal Yisroel at the Creator's will and for reasons
known and comprehensible only to Him."
