What was the event that symbolized the fear of immigrants during the Red Scare?

The event that symbolized the fear of immigrants during the Red Scare was the Palmer Raids, which began in 1919 and intensified in 1920. Led by U.S. Attorney General A. Mitchell Palmer, these raids targeted suspected radicals, anarchists, and immigrants, resulting in thousands of arrests and deportations. The raids were fueled by widespread anxiety over the perceived threat of communism and social unrest, reflecting a broader xenophobic sentiment that equated immigrants with political subversion. This period marked a significant crackdown on civil liberties, particularly for those of foreign descent.