The Voice for Religious Freedom Knows No Borderby Maureen Walther and Jennifer Daigle
In this article, there is a section on how Margaret Sanger praised the Klu Klux Klan for their persecution of Catholics and Jews.
Additionally, the article mentions Jesuit Father Wilfrid Parsons, in the 1920's an author of America Magazine. He wrote the book Mexican Martyrdom, detailing aspects of the Mexican persecution of Catholics in the 1920s and 1930s.
There may be 1000's of Klu Klux Klan members shown in the picture -- it is hard to judge. This is on page 20 at the top of the page for the May 2012 edition of Columbia Magazine