Mark [Marc] Zborowski (January 27, 1908 – April 30, 1990) (AKA "Marc" Zborowski or Etienne) was an anthropologist and an NKVD agent (Venona codenames TULIP and KANT). He was the NKVD's most valuable mole inside the Trotskyist organization in Paris during the 1930s and in New York during the 1940s.
Source: Wikipedia, March 27, 2019
The collection contains:
FBI files concerning the investigation on Zborowski, 1938-1966
FBI file concerning Boris Nikolaevski, 1949-1955
FBI file containing information on Raphael Abramovitch, 1938-1955
FBI file containing information on David J. Dallin, 1940-1968
FBI file containing information on Russian émigrés, 1951-1953