What was the main reason Americans were upset by the Palmer Raids of 1919 and 1920?

Americans were primarily upset by the Palmer Raids due to the perceived violation of civil liberties and the use of excessive force against individuals suspected of radicalism. The raids were characterized by their lack of proper warrants and widespread arrests, which many viewed as a violation of constitutional rights. Additionally, the raids heightened fears of government overreach and fueled anti-immigrant sentiments, leading to a backlash against the perceived hysteria surrounding the Red Scare. Overall, the aggressive tactics used during the raids sparked significant public outrage and concern over the erosion of democratic principles.