I recently received the translation of a book in which it states
that my great-grandfather David Russ was a (the?) leader of the
Cherkov Hasidim in Boryslaw, ca 1900.
So, two questions - who were the Cherkov Hasidim (followers of a
particular Rabbi?; I've googled and found a R. David Moshe from
Cherkov). Second, would they have kept any records that might
have survived? - which could, perhaps, give me more insight into
the life of my great-grandfather.