Earlier this week, the ACLU published this[0] article, "The Problem With Censoring Political Speech Online – Including Trump’s". More substantively, they recently filed a brief[1] supporting Americans for Prosperity (the Koch brothers' primary political advocacy group) fighting against a government demand for donor lists. That's just the stuff I found on the national website with a minute or two of looking around—I didn't even dig into what state ACLU groups are doing, and they do the bulk of litigation. Abandoned free speech they have not.
[0] https://www.aclu.org/news/free-speech/the-problem-with-censo...
[1] https://www.aclu.org/legal-document/prosperity-foundation-v-...