The graphic’s date appears wrong, it is credited to her work in Birth Control Review, April 1933: http://www.ewtn.com/library/prolenc/encyc068.htm – and elsewhere:
[Slavs, Latin, and Hebrew immigrants are] human weeds … a deadweight of human waste … [Blacks, soldiers, and Jews are a] menace to the race… Eugenic sterilization is an urgent need … We must prevent Multiplication of this bad stock. — Margaret Sanger, April 1933 Birth Control Review.
Don’t take my word for it. Read Margaret Sanger’s Eugenic ramblings yourself!!