Summarize the effect of the growing fear of communism at home in the united states.

Well, the most notorious movement that caused by the growing fear of communism at the home in the united states would be : The Red Scarce
It's a violent movement that was lad by anarchist groups that spread terror within U.S society based on their fear of growing communism in the united states (the term red in red scarce refer to the soviet union flags)

hope this helps