Memes

I've done a couple of things with the DSA and the PLA, but as orgs they're kinda ... eh. I wouldn't be surprised if some local orgs near you might also collaborate with the DSA though, so you might be able to just ask about other groups from your local DSA chapter.

We get (and donate) food to established pantries and shelters, so you could also ask at some local food banks for group suggestions to get involved with.

Finally, check for zines posted on local classifieds, libraries, or refill stores. A lot of promotion of these kinda things is still somewhat underground, but you're likely to find connections to leftist spaces from generally socially conscious or modern subversion spaces (plant swaps, gay bars, local owned weed shops, thrift stores, DIY music houses, etc).