How did the red scare and the sacco vanzetti case contribut to immigration laws?

The Red Scare heightened fears of Communism in the US, leading to stricter Immigration laws like the 1924 Immigration Act that limited the number of immigrants allowed into the country. The Sacco and Vanzetti case, involving two Italian immigrants accused of a crime they may not have committed, fueled anti-immigrant sentiment and furthered the perception that immigrants were dangerous and posed a threat to American society.