There was a fear of socialism, anarchism, communism and bolshevism due to the chaos associated with all four, and due to the change that it would bring.
Deep rooted fear of change in American people.
Middle class and upper class people felt the most threatened by communism, due to their current wealth and power.
Communist countries such as Russia after the Russian revolution were threatening worldwide revolution, (widespread communism)
1919: Post WW1 Outbreak of unrest
3,600 strikes across USA - letter bombs.
40 mail bombs received by important politicians and industrialists
8 cities experienced bomb attacks, including General Palmer!