cantoresq,
I’m unfamiliar with R. Esriel Hildesheimer or the Sridei Eish. My apologies for my unfamiliarity with every Rabbi of past and present.
The Satmar Rebbe’s talmidim purchased a train ticket out of Hungary from Kastner ym’s (much like Rebi Yochanan ben Zakki saved the Rabbonim in Yavneh through Vesapian), after Kastner sold the lives of 600,000 Hungarian Jews to Adolf Eichmann in exchange for his train. (Who aside from the tickets he sold for his profit, Kastner mainly filled with his family and Zionist friends.)