Squatting in Spain refers to the occupation of unused or derelict buildings or land without the permission of the owner. In Francoist Spain migrant workers lived in slums on the periphery of cities. During the Spanish transition to democracy, residential squatting occurred in Spanish cities such as Barcelona, Bilbao, Madrid, Valencia and Zaragoza. From the 1980s onwards a new generation of squatters set up self-managed social centres which hosted events and campaigns. The 1995 Criminal Code among other things criminalised squatting, but failed to stop it. Social centres exist across the country and in Barcelona and Madrid in particular. In the Basque Country they are known as gaztetxes.