New book looks at Philadelphia pastor who spied for Nazis

... a cryolite metals plant in Philadelphia, the Horseshoe Curve railroad pass near Altoona, and Pennsylvania Station in Newark, N.J. Krepper was the Rev. Carl Emil Ludwig Krepper, who had emigrated to America, become a citizen, and served congregations ...

http://www.philly.com/philly/news/20141130_New_book_looks_at_Philadelphia_pastor_who_spied_for_Nazis.html