Rabbi Yosef Rozin, commonly known as the Rogatchover Gaon, was the hasidic rabbi of Dvinsk connected to the Chabad hasidic dynasty. He also supposedly gave smicha (ordination) to the late Lubavitcher Rebbe Menachem Mendel Scheneerson, although some contend this is not actually true. Rozin's son-in-law passed away, and that created a unique dilemma for him that migh shock you.
From Bernard Wasserstein’s On the Eve: The Jews of Europe Before the Second World War:
Update 9:00 am CDT – Wasserstein's source is Marc B. Shapiro's Between the Yeshiva World and Modern Orthodoxy, pages 95-96.
I don't have that book, so I emailed Dr. Shapiro and asked him to clarify.
He said Wasserstein has the story backward.
When Rozin's son-in-law died, Rozin's daughter needed to do halitzah. But her husband's two brothers were no longer haredim – one was an apostate and the other a communist.
The Rogatchover chose the apostate – not, as Wasserstein mistakenly wrote, the communist.