Yes, I experienced this as well, though it was about 8 years ago. I was really disappointed in the ACLU, I would have thought of all people they would be the last ones to sell off private information. It bothers me that all these groups have spent more money on sending me mail in the ensuing years than the original donation amount to the ACLU.

At least now it seems like they let you opt out.

This is a problem in the non-profit industry that should get addressed, especially given younger generations are less likely to respond to mailers anyways.