The ACLU has defended literal neo-Nazis and white supremacists right to rally and share their ideas on several occasions. Sounds like you would disagree with them, and that people should be imprisoned for having disgusting and hateful ideas. Fortunately, you're wrong.
Don't conflate words with actions like hurting someone. There are very narrow restrictions on speech, mostly around calls or threats of imminent violence. But those are extremely rare cases, and they're not what you are broadly describing.