I thought I'd share what I've learned.
In the old days (and still occasionally) this was a screenshot or manual RT.
I call these the "soldiers".
I doubt their specific tactics actually matter much.
The soldiers' goal is to *appear numerous* to people reading your tweets.
But if you want to stop the attack, you must find and block the screamer.
The soldiers rarely include the screamer in their replies, in order to prevent you finding and blocking them.
The Nazis will then think of a new tactic.
Bad guys work full time.
(end)