I looked at the 990 for the ACLU Foundation of NJ, and they claim $0 for "Government contributions (grants)".
They also claim investment income, and are supposed to declare what they're invested in, but didn't in '04, the only year I looked. They also filed a 3-month extension though, so may have at that time.
It's not so much grant money that this relates to as it is the question of whether you get a tax deduction by making a contribution to the organization. The ACLU Foundation is tax deductible, but can't engage in lobbying. The main ACLU entity is not tax deductible but can engage in lobbying.
I don't think either organization should be tax deductible.