Yes, admins can see all the votes.
You're kind of a downvote collector so it wasn't easy, but I didn't actually see all that much brigading. Seeing some repeat usernames and one occurrence that looks like someone did go through your profile and downvote most comments about a certain topic once, but that's all I could find. Most set of downvotes are confined to a given post.
You're really just getting downvoted a lot by a lot of different people. Your downvotes on this post have nothing in common with your other downvotes.
EDIT: Nevermind, there is indeed 2 people downvoting every comment from OP.