One of the groups that is promoting a "third Palestinian intifada" has a webpage where they solicit donations - through PayPal.
PayPal's policy prohibits it providing services to those "who commit, threaten to commit, or support terrorism."
So complain to PayPal and get the funding for today's terrorist supporters stopped. Use words like terrorism, complaint, breach of contract, PayPal policies. You do not need to be a PayPal customer to do this.
(h/t Daphne Anson)