Sometimes, it’s the stars of the show or movie that make it truly beloved. But sometimes, we can enjoy several years of seeing our favorite stars on the screens, before they disappear without a trace and we’ve no idea where they’ve gone, or why.But the truth is that Hollywood is a cutthroat place, and one wrong move can mean a promising career cut short in an instant—and certain actors are never seen again.Let’s take a look at some of the most popular stars of the past who ended up on the Hollywood blacklist—and why.