It is illegal to provide material support to a designated terror group like Hamas. Doesn't have to be funding or providing materials. Can be training or advising terrorists. Acknowledging first amendment protections, I think some of protests come awfully close to the line.
There have been numerous pro-Israel demonstrations across the the country. There was one at the Hamas demonstration at the White House. It was brief, because as one would expect the terror supporters turned violent, and rather than confronting them, the Capital police evacuated the pro-Israel group. I guess violence n the name of terror groups exempts one from things like disturbing the peace or even assault. At least in front of the President's rental. Wonder how far terrorists can go legally.
Pro-Israel US Marine Attacked By Pro-Hamas Mob – Punched, Kicked, Spat On (at White House)
BREAKING: Israel Supporters Evacuated From Front of White House Under Police Protection
As long as the Marine is pro-Israel, this is OK.
The mob was screaming “Allahu Akbar!” during the attack. The spat on him, kicked him and punched him in the face