| socialistinternational.org | The Socialist International |
| ibrp.org | International Bureau for the Revolutionary Party |
| broadleft.org | International Organizations and Conferences of Leftist Parties |
| wsws.org | International Committee of the Fourth International |
| worldsocialism.org | The World Socialist Movement |
| union-communiste.org | International Communist Union |
| socialistworld.net | Committee for a Workers' International |
| isg-fi.org.uk | The Fourth International (United Secretariat) |
| icl-fi.org | International Communist League |
| bolshevik.org | International Bolshevik Tendency |
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