There is an email going around and there will be tens of thousands (HOPEFULLY) dumped on their office this Christmas season.
They WILL open them because a lot of their mail is donations.
Take up their time and give them a massive headache
I just printed off an 8x10 MERRY CHRISTMAS Celebrate the Birthday of Our LORD JESUS and put it into a standard #10 business envelope so it wouldn't look like a card. I also used a security envelope so they couldn't see through and know there wasn't a check.
I suggest passing this great idea to EVERYONE in your email friends list... make this a CHRISTMAS the ACLU will never forget!
Their Address
ACLU
125 BROAD STREET
18th Floor
NEW YORK, NY 10004
although I think your ACLU christmas card is a good idea, spamming it in unrelated threads is not.