Mordechai/Mitya Gurary

http://www.chabad.org/library/article_cdo/aid/1837176/jewish/Memoir... Memoirs of Rebbetzin Chana - Part 27 The Rebbe's brother Yisroel Aryeh Leib http://en.wikipedia.org/wiki/Rabbi_Menachem_Mendel_Schneerson

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His youngest brother Yisrael Aryeh Leib Schneerson was close to his brother, often traveling with him...
He changed his name to Mark Gourary and... Escaping Russia was no easy task. At times, the group of escapees literally faced death. In the process, Yisroel Aryeh Leib, who left Russia using the passport of Mordechai Gurary,...

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Regina Yanova – wife:
A long-time friend of Rabbi Levi Yitzchok, Mordechai Gurary, had drowned while swimming. Since passports then had no photos, Leibel was able to use his passport to cross the border. He called himself Mark Gurary thereafter

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http://www.jewishtelegraph.com/roots_129.html SEARCHING FOR REBBE'S BROTHER