Okay, kiddo, so let's talk about the first red scare, which happened a loooong time ago, in the early 20th century.
At that time, a bunch of people in the United States got scared that their country was going to be taken over by communists or socialists. These were political systems that some folks thought were dangerous and un-American.
So many people got scared that the government and some other groups started to hunt down anyone who they thought might be a communist or a socialist. They wanted to find these people and punish them, because they thought they could be spies or trying to overthrow the US government.
This hunt for communists and socialists was called the first red scare. Some people lost their jobs, others were arrested, and some even got kicked out of the country.
Even famous people, like actors and writers, were accused of being communists or socialists. They had to go to court to prove that they were not trying to take down the US government.
Overall, the first red scare was a time when many people were afraid of certain political ideas and went to extreme measures to protect their country. But later on, people realized that this fear and suspicion had caused a lot of harm to innocent people.