During WWII my recently deceased US Army grandfather helped break up a German spy ring near the Panama Canal. Does anybody know more about this or operations like it around Panama?

I'd recommend searching through this book: Max Paul Friedman, [Nazis and Good Neighbors: The United States Campaign Against the Germans of Latin America in World War II] (https://books.google.com/books?id=qYeYaDs1xR4C&dq=max+paul+friedman+good+neighbors&source=gbs_navlinks_s) (2003), which [discusses Panama] (https://books.google.com/books?id=qYeYaDs1xR4C&printsec=frontcover&dq=max+paul+friedman+good+neighbors&hl=en&sa=X&ei=oY0sVdCFE_aIsQSCwoD4Cg&ved=0CCYQ6AEwAA#v=onepage&q=panama&f=false) at length.