The House Unamerican Activities Committee (HUAC) was a congressional group designed to "root out" individuals who were Communists or suspected of being Communist in post World War II America.
Japanese Americans were interned at camps because of their Japanese heritage. No one knows who would go against the U.S after the pearl harbor bombing. They were kept in horrible conditions(Not as horrible as hitlers, but still horrible). They were kept in Suicide-Free containers, and got little food. I hope I could help. Have a wonderful rest of the day.
Even though the Holocaust was a tragic and painful experiment people share their story to spread awareness against cruelty and pervent a historic yet horrific event like that from happening again. Hope that helps :)
The fear of communism was a real thing because it was basically a witch hunt for a witch that didn't really exist. Everyone was afraid of communism, there was propaganda posters that scared americans and it created a new term called mcCarthyism.