International Working Union of Socialist Parties Internationale Arbeitsgemeinschaft Sozialistischer Parteien | |
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Founded | 1921 |
Dissolved | 1923 |
Succeeded by | Labour and Socialist International |
Ideology | Centrist Marxism Socialism |
Political position | Left-wing |
Colors | Red |
The International Working Union of Socialist Parties (IWUSP; also known as the 2½ International or the Vienna International; ‹See Tfd›German: Internationale Arbeitsgemeinschaft Sozialistischer Parteien, IASP) was a political international for the co-operation of socialist parties.