I don't think you can fault the ACLU? In my experience: I donated a few times in the past and now I am a guardian of liberty (monthly donation) and I've never gotten any solicitations from any other charity/organization. However in college I never donated to any charity (wasn't stingy, just prioritizing being able to eat and pay rent at that time...) And I got piles and piles and piles of solicitations for those organizations you've mentioned. I don't know where the "leak" came from.