Series contains research files, manuscripts, and typescripts for Roos's book on F.K. Ferenz, a member of the German Bund in Los Angeles who distributed Nazi propaganda from his bookshop in Los Angeles. Also included in this series are manuscripts of two other (also unpublished) works on similar topics and Roos's correspondence with Dr. Leonard Pitt, with whom Roos was writing a work tenatively titled Under the Crooked Cross.

Series contains research files, manuscripts, and typescripts for Roos's book on F.K. Ferenz, a member of the German Bund in Los Angeles who distributed Nazi propaganda from his bookshop in Los Angeles. Also included in this series are manuscripts of two other (also unpublished) works on similar topics and Roos's correspondence with Dr. Leonard Pitt, with whom Roos was writing a work tenatively titled Under the Crooked Cross.

Series contains Roos's research files on various topics related to the Nazi party, white supremacy groups in the United States, or anti-Semitism in the United States. Files include correspondence, copies of source material, and Roos's notes on the materials.