You'll need the Football Hooligan character class for this. turn Islington & Hackney district into defiant (finish all the red icon missions and the mission that unlocks after) and you'll be rewarded with that character or get lucky and find a character with that trait among the fighters you fight in the Bare Knuckle League). press RB to summon your followers. note that they will disappear if guns are pulled. they don't have to knock out 3 Albion guards in one summon, just in total.
Edit: this has to be done on any other Albion other than the Albion employees. If you pick a fight with them yourself you aren't able to perform a takedown so they lean towards being a civilian other than an actual enemy. I'd say get the level 1 pursuit by beating up people and summon your followers when the Albion shows up.
credits to Pr0P014kZ for mentioning this
The Fallen Sky:
Turns out, Protest Leader using the megaphone also counts towards this achievement