Ask Lemmygrad

And offline and on air gapped machines if they wished. In person and not only that in code as well hidden under other things, traditionally book clubs were used but that's a well known, anything with wide interpretation like the arts or even the occult are good ones and it doubles as a way to agripop too potentially or it could be just merely aesthetics to the unaware eye, also allows you to play very it straight as required and blend in.

You go way back to fighting the godly power of kings and people got real creative about dealing with it, we're dealing with a whole pantheon now. There are so many ways one could not even think of them all, they may have a near perfect panopticon but processing the data is another matter anyhow. Read books about creativity and idea generation as well. There's good opsec guides around and on 6bear.