KnowraOPECLinked fromLinked fromThe 34 pages that link to OPEC, each with the reason it gives.All 34Related 28Narrower topic 3Compared with 3Gulf Cooperation CouncilCompared with: It overlaps with the council on energy matters but has a global, oil-centered mandate.Anglo-Persian Oil CompanyCompared with: Its producer-country coordination challenged the market power of companies such as Anglo-Iranian.Seven SistersCompared with: It gave producer states a collective forum to contest the Sisters' influence.