Acronym for an oil-rich grp

• *Mideast ... pipeline ... embargo
• Congo's new group
• Iran is a mem. of it
• Grp. founded in Baghdad, 1960
• "Black gold" gp
• Grp. that sets oil benchmarks
• Oil cartel (abbr.)
• Powerful energy cartel
• Source of some of the oil for 31-Down

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
initialism (acronym) for Organization of Petroleum-Exporting Countries, founded 1960.