The ACLU is a 501c4. There's also the ACLU Foundation which is a 501c3 and in exchange for being able to receive tax deductible donations accepts limits on wha

The ACLU is a 501c4. There's also the ACLU Foundation which is a 501c3 and in exchange for being able to receive tax deductible donations accepts limits on what it can do politically. See https://stateimpact.npr.org/florida/2013/04/05/explaining-the-differences-between-501c3-and-501c4-non-profits/ https://stateimpact.npr.org/florida/2013/04/05/explaining-th... The NRA is also a 501c4. The EFF is a 501c3, which limits what sorts of political work it can do.