The International Working Union of Socialist Parties was founded in Vienna, bringing together socialist parties from numerous countries to create a cohesive platform for their ideologies and objectives. This assembly was crucial during a time of unrest and upheaval in Europe, where the aftermath of World War I had led to widespread social and economic challenges. The conference sought to address the needs and aspirations of the working class by reinforcing their rights and fostering international collaboration among socialist organizations. It provided an invaluable opportunity for socialist leaders to network and strategize to enhance their collective influence in their respective nations.

Among the notable figures present were leaders from various socialist movements who contributed to the foundational discussions, emphasizing the significance of unity in an era marked by political fragmentation. The gathering explicitly outlined its commitment to supporting workers' rights, social justice, and the establishment of democratic socialist systems. By officially forming the International Working Union, these parties aimed to enhance their communication and strategize more effectively against the rising tides of capitalism and fascism subsequently witnessed throughout the 20th century.

The founding conference was not just about creating an organization; it was a symbolic milestone that showcased the determination of socialist parties to stand together in the face of adversity. The decisions made in Vienna had lasting ramifications, influencing future political alignments and the direction of socialist movements worldwide. Over the years, the Union would play a role in shaping international socialist policies and engagements, asserting the necessity of collaboration as a critical element of social progress.