"Gemeindebauten have become an important part of the architecture and culture of Vienna since the 1920s. Up to 1918, the housing conditions of Vienna's growing working class were appalling by modern standards. When the Social Democratic Party of Austria gained control of the municipal administration during Austria's First Republic (1918-1934) (so called "Red Vienna"), it began the project of improving living conditions for workers. A large number of Gemeindebauten, usually large residential estates, were built during that time. Including those buildings that were finished after the events* of February 1934, 64,000 apartments where completed, which created housing space for about 220,000 people. Apartments were assigned on the basis of a point system favoring families and less affluent citizens."
*) "The Events":
"The Austrian Civil War ( Österreichischer Bürgerkrieg), also known as the February Uprising, is a term sometimes used for a few days of skirmishes between socialist and conservative-fascist forces between 12 February and 16 February 1934. "
More info on "Gemeindebauten" here at wikipedia
Sigmund Freud Hof, Wien Alsergrund