Sanger founded and edited the Birth Control Review (BCR) from 1917 to 1929. Many eugenicists were published in it, and she made many eugenic comments in her own articles.
Be aware that Sanger did not edit the journal after January 1929, so any articles published after that time cannot be attributed to her editorial work. (There were, for example, articles by Nazis in the Birth Control Review in the 1930’s, but Sanger would not have had anything to do with their presence in the journal.) Sanger was a committed eugenicist, but there is no evidence that she was a Nazi sympathizer. Not all eugenicists were Nazis; in fact, some eugenicists were Jewish. It is important to be accurate!
Here is one example of her eugenic ideology coming through on the pages of the BCR:
"Like the advocates of Birth Control, the eugenists, for instance, are seeking to assist the race toward the elimination of the unfit. Both are seeking a single end, but they lay emphasis upon different methods. ... Eugenics without Birth Control seems to us a house builded [sic] upon the sands. It is at the mercy of the rising stream of the unfit."
Margaret Sanger, “Birth Control and Racial Betterment,” Birth Control Review, Feb. 1919, p. 11-12, emphasis added