Well, Hamas is a Palestinian extremist organization in Gaza, so who I think you mean is Hezbollah. They are in Lebanon but are totally backed by Iran and ARE involved in helping Assad in Syria, as is the Iran regime itself.
As for the Muslim Brotherhood and al-qaeda - the Brotherhood actually gave birth to al-qaeda years ago. It’s sort of a “respectable” front group for the famous back group of avowed terror. It is hard to know precisely what the Muslim Brotherhood is doing at any place, any time. They are not transparent, to borrow a discredited Obama word. Where we do see and hear them, such as in Egypt, they are involved in politics and appear to be a political party interested in winning elections. But that is just the aspect they WANT to be shown.
Al-qaeda on the other hand is very apparent in their actions and they are heavily involved in Syria on the rebel side.
Obama either knows what he’s doing and is coming down on the worst side in a war in which there is no good side, or he doesn’t have a clue what he is doing but insists on doing it anyhow.
Either way, the prospect is frightening.