Is there a defense fund for protesters wrongly arrested while exercising their constitutional rights?

I’m not talking about people who resort to violence or destruction of property. But the YouTube videos are damning. Most of the arrest are peacefully protesting. They have the constitutional right to assemble, to petition their government for redress of grievances, and to exercise free speech. I want to donate to a fund to pay for each and every such arrest to be appealed as far as possible up through the courts till the system is so overburdened that Judges have no choice but to respect the Constitution.