Katzman from Mogilev gubernia ???

Before proceeding you need to ascertain EXACT PLACE OF ORIGIN.

Mogilev(skaya) gubernia/region > Russian Empire is very general.

Above is like saying family from New England.

Have you examined immigration documentation for your Immigrant Ancestor?
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http://www.jewishgen.org/belarus/mogilev.htm

http://www.jewishgen.org/databases/vsia/vsiabelarus.htm