Quick overview at this moment:
Use this list as a starting point to see if you can find other links between them. Do not use my list as absolute proof. It is very common for two users to use the same IP at one point or another; 364 users have used the same IP as master-p, and the vast majority of them are not the same person.
Some of them seem to trade in the same goods (CS:GO skins, steam stuff, bitcointalk/reddit/etc accounts) and frequently trust "each other" - so I am sure there are much more "links" then the above listed ones. Obviously not every "link" is proof though.
Be free to quote/update/etc.