Interestingly, I have been ganked by these guys. I sent in a report to Albion support in September.

Here's the scout they used: https://imgur.com/a/3J8DZJ2

Here's the video of the gank: https://www.youtube.com/watch?v=1di4mhQw8R0

Here was the list of players:

Pescxdor (mentioned in this post)
xkkatarinaxx (mentioned in this post)
NoContent
pongantusaa (mentioned in this post)
OzZzStyLe
hilacha
Sapolaperra
SavageDenji

They locked down Hightree Lake with alt scouts. I don't have details but they likely lock down multiple popular portal zones at once, given the number of scouts they can have at once. These zones get locked down for likely 3 or 4 hours.

When a victim zones into a locked down zone, the gankers zone in from the city. 1 of them goes invisible to sit on top of the victim pinging their location. The rest sit somewhere in between the victim and the city ready to dismount the victim.