KKK was not just Southern. There were a political force to be reckoned with in Indiana.
The 1920’s KKK was everywhere like that women’s meeting in New Jersey that Margaret Sanger spoke to.
Indiana was a Klan state, they were active in my part of Pennsylvania as well.
The 1920’s Klan opposed the “evils” real or imagined of the Roman Catholic Church and Catholics of Southern and Eastern European descent like Al Capone.
Down in Alabama a lawyer named Hugo Black helped the KKK back then. FDR appointed him to the Supreme Court.
In 1947 Black wrote the ruling in the Everson case against public school resources being used to help Catholic schools.
His decision introduced the phrase “separation of church and state” into modern jurisprudence. Lawyers and judges who followed him succeeded in using it to rewrite the original meaning of the First Amendment.