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| fox.nstn.ca/~huot/ontarioascd | OASCD (Ontario Association for Supervision and Curriculum Development) | |
| www.ocaw.org/ | OCAW (Oil, Chemical & Atomic Workers International Union) | |
| www.ofl-fto.on.ca | OFL (Ontario Federation of Labour) | |
| www.oegb.or.at | OGB (Austrian Trade Union Federation) | |
| www.opeiu.org | OPEIU (Office and Professional Employees International Union) | |
| www.opseu.org | OPSEU (Ontario Public Service Employees Union) | |
| www.osstf.on.ca | OSSTF (Ontario Secondary School Teachers' Federation) | |
| www.otffeo.on.ca | OTF (Ontario Teachers Federation) | |
| www.psac.com | PSAC (Public Service Alliance of Canada) | |
| www.pwu.ca | PWU (Power Workers Union) | |
| www.stonecarver.com | SCUNA (Stone Cutters Union of North America) | |
| www.sfl.sk.ca | SFL (Saskatchewan Federation of Labour) | |
| www.smwia.org | SMWIA (Sheet Metal Workers International Association) | |
| www.stf.sk.ca | STF (Saskatchewan Teachers' Federation) | |
| www.sailors.org | SUP (Sailor's Union of the Pacific) | |
| www.teamster.org | TEAMSTERS (International Brotherhood of Teamsters) | |
| www.tuc.org.uk | TUC (Trades Union Congress - UK) | |