To my knowledge, it doesn't in any practical way, largely because it's almost impossible to prevent financial resources from reaching grantees, especially those with vast diaspora networks such as the people of Gaza.  As I understand it, Saudi Arabia, funds a lot of such civil society activities in Gaza, (and even Venezuela sends humanitarian aid, whatever that might be) perhaps to the chagrin of Israel and the many in US. And the US certainly allows political organizing against its policies in the middle east within the US, where the policy is actually made.