Likewise. I have some reservations about the ACLU (but nonetheless support many areas of their work) but wholeheartedly support the ACLU.
Because I know folks will ask me, I think that antidiscrimination law and things like first amendment rights so frequently conflict that I think there is a real conflict of interest when an organization takes on both. The ACLU does take on both, or they claim to, but this usually means pushing antidiscrimination law over first amendment issues, which I think is a real problem.
The ACLU's position in a lot of issues like Hosana Tabor v. EEOC was wrong (so wrong that all 9 justices disagreed with the ACLU and stood up instead for civil liberties), and they are for corporate free speech on political issues (Citizens United) unless that is discriminatory (Willock Photography). And so forth.
As a recurring donor, I'm interested to hear what you don't like about them.
As for protecting security researchers, I suspect the gov't is more interested in (and likely to harass) Applebaum et al than you guys.