1931 Barcelona rent strike
The 1931 Barcelona rent strike was called in July 1931 by Confederación Nacional del Trabajo (CNT) as a result of a massive immigration wave to Barcelona for jobs constructing the 1929 International Exposition, the Wall Street crash of 1929, and political instability. By the following month, 100,000 working-class families had joined it.
Source: Wikipedia — 1931 Barcelona rent strike (CC BY-SA 4.0)