Correct, it is a communist organization, has been since day one and has never changed.
The stated purpose of the ACLU is to use America's legal system to promote it's communist agenda.
The founder {Baldwin} was an avowed communist, and the organization has never wavered from it's roots.
Actually, it did waver for a while. Don't forget the "was" part. There were a lot of Americans who were all starry-eyed over Stalin in the 20s and 30s. The smarter and less delusioned ones later acknowledged his atrocities and dropped support for communism. Baldwin was one when he purged the ACLU of communists in 1940. That included one of the founders, Elizabeth Flynn, who remained a staunch commie and Soviet supporter for the rest of her life. OTOH, they were allowed back in the 60s and Flynn's status was officially rehabilitated in the 70s. So the ACLU did have a period where communism was officially unacceptable.