A local ACLU affiliate may be able to assist with finding representation. The First Amendment Coalition legal hotline is another option. There's also the American Bar Association lawyer referral directory (or just put "[your state] bar association" into your search engine of choice and browse for its lawyer-finding resources).

Many places offer pro bono representation for those who cannot afford to defend themselves. Doesn't mean it's easy or that it isn't a pain in the ass to have to go through the process but the alternative is letting the bastards win and that's unacceptable to vertebrates.