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1. Krivoshein → Khrivoshin or Krivoshin
2. Unshlikht → Unshlikht or Unshlikh
These are the likely non-Russified forms, closer to the original Yiddish or Eastern European roots.

Unshlikht becomes Unschlicht in German transcription, and there is a notable namesake with this surname:

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https://de.wikipedia.org/wiki/Josef_Unschlicht

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(article in German).

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Unschlicht can be analysed as a German adjective un-schlicht "not simple, not plain, not stupid". I don't know if there are specific Jewish connotations for the choice of this surname going beyond the simple German meaning. Unschlicht is a rare to obscure name in Germany, a phone book search gives zero hits, and GND authority control data have one the Josef Unschlicht mentioned above.