There's a short story by J.B. Priestley called "The Grey Ones". There's debate on whether or not it's actually an allegory for jews, but the most famous quote is:
>"...All you can definitely say is that they're not human. They don't belong to us. They don't like us. They're working against us. They have their orders. They know what they're doing. They work together in teams. They arrange to get jobs for one another, more and more influence and power. So what chance have we against them?"