> the actions they take against the people

I don't think you know what the IRGC is. When you say "the people" I assume you mean those of Iran, but the IRGC is an international body. They oversee their proxies in the ME, like Hezbollah, and are responsible for the Shia militias in Iraq and Syria as well. They have a strong presence in Syria (which Israel is bombing), including creating and launching drones. Their main business is exporting terrorism, so the designation is not only apt, it's only decades late.