They pretty much couldn't be more obvious. There was a long uncontested border between them throughout the whole game.
Then I looked into it and they play together an awful lot and, surprise surprise, have the same exact responses when other players accuse them of secret diplomacy.
They're shockingly lazy about covering their tracks, too. Surprising, really.
Accused:
Wunjo
thescarab
The accused are suspected of:
Being Multis
Conducting Secret Diplomacy
Game number(s):
Game 14504123