1) DC-based intercontinental grp 2) ABC countries and more 3) Alliance for Progress gp 4) Alliance for progress group 5) Alliance for Progress grp 6) Alliance headquartered in DC 7) Alliance of 1948 8) Alliance since 1948 9) Allied group since 1948 10) American org 11) American PAct org 12) Arabian solidarity org Found on https://www.crosswordclues.com/clue/oas