I just recently emailed the ACLU to cancel my donation, and a week later got an email back confirming the cancellation no problem. It wasn't exactly transparen

I just recently emailed the ACLU to cancel my donation, and a week later got an email back confirming the cancellation no problem. It wasn't exactly transparent, since the only place mentioning who to email was the "welcome" email I got when I signed up ages ago. But I was able to cancel by a single email to the address they'd provided.