You can actually advocate violence legally in the US, just not as directly as you might want to. Talk to a lawyer first. Some of the key things to remember are

You can actually advocate violence legally in the US, just not as directly as you might want to. Talk to a lawyer first. Some of the key things to remember are that you don't mention a time or place of what you want to happen, and leave the details of exactly who's going to do it and what the specific action is a bit fuzzy.