Which groups objected to immigrants feared the Red Scare and believed white Protestants were better than others?

During the Red Scare, various groups, including nativists, white supremacists, and some religious organizations, objected to immigrants due to fears of communism and social upheaval. They often viewed white Protestants as superior, promoting the idea that American culture and values were threatened by the influx of immigrants, particularly those from non-European backgrounds. This sentiment was fueled by economic anxieties and xenophobia, leading to increased discrimination against immigrant communities.