Customers who bought this also bought...

So the USHMM shooter was apparently influenced by a book called Iron Curtain Over America. I hadn't heard of this book, so it drew my attention.

On the Amazon page, customers who bought this book also bought an interesting list:

• The Synagogue of Satan probably needs no explanation
  
• James Petras's antisemitic Rulers and Ruled in the US Empire
  
• Koestler's bizarre The Thirteenth Tribe
  
• The Revolution: A Manifesto by Ron Paul
  
• Palestine: Peace Not Apartheid by Jimmy Carter
  
• And something called The Transparent Cabal