It’s rather straight forward: You first get in touch with Razor and Blade, you can find them DJing at the local night club, and they make a series of calls and the hackers of the world unite around them.

This was covered in the 1995 documentary “Hackers”

Things are pretty ad-hoc, peer to peer. Sometimes signal, sometimes old-fashioned irc (usually people have their own clients for e2e). Pubkeys are often shared around more general discussion on onion boards.

It's easy to personify what we could call "brands" like Anonymous, but the reality is there are many "tribes" who range in size and culture, frequently working collectively towards disrupting power structures.

Nice try, FBI.

These days you just tweet at Kirtaner, apparently

20+ years ago it was a lot of private IRC servers/channels and some FTP sites for sharing on random owned boxes.

If you don't already know, you probably don't want to try committing cyber attacks against a nuclear state.