- Click on the big button in the header next to ‘Local’ that says ‘All’.
- Click the drop-down field directly next to ‘All’.
- Click ‘Active’ from the drop-down list.
- Click on a thread loaded on the page.
- Reply to users in that thread.
Congrats! You have successfully done a brigading! Pat yourself on the back! Next seminar, we will be covering how to subtly deceive strategically-important redditors with a simple tactic they don’t know of called ‘whataboutism’ 
Edit: meant to post this in the secret group chat where we coordinate the fall of the west. Sorry y’all. My bad 
well put
You either let people share links to your space, or you do not.
Selectively banning people from linking to your space if they feel negatively about something and only allowing people to link to that space if they feel positively about it is genuinely the fostering and creation of echo chambers. It's intended to suppress disagreement and I have no other way to explain it than that.
Witchhunting is a different matter, such as the boston bomber fiasco, where hundreds of thousands of people regularly got the "suspect" completely incorrect and harassed real and innocent people multiple times. Hunting and internet-detective shit is not the same as sharing content for the purposes of critique.
I understand I'm just saying the same thing in more words here but I think there's probably a better way to put this that can be found to eventually put the issue of "brigading" to bed altogether.
It's the liberal word for "cancel culture". Just like the word tankie is used to attack their left while the conservatives use "woke" to attack to their left. Liberals use the same tactics. Cancelling is used by the conservatives to attack left while liberals use brigading to attack people to their left.