How did xenophobia cause the red scare and the palmer raids?

Xenophobia is the fear of outsiders or essentially anything that's "different". And what was the Red Scare and Palmer raids about? Eliminating the outsiders (immigrants, communists, etc.) and labeling them as a "threat". The Red Scare and Palmer raids were a direct result of paranoia that oftens takes this country (the U.S.) from time to time.