There Is No Cabal is a catchphrase used on Usenet. Its common abbreviation, TINC, is used humorously to suggest that people should lighten up and not see a conspiracy around every corner. It is alternatively used as a pseudo-ironic statement, since presumably an insider or someone who knows "the cabal" would inevitably deny that there is a cabal. It was used extensively by members of the backbone cabal.
References
There Is No Cabal Wikipedia(Text) CC BY-SA