Meibion Glyndŵr (), also known as the Valley Commandos, was a Welsh nationalist movement violently opposed to the loss of Welsh culture and language. They were formed in response to the housing crisis precipitated by large numbers of second homes being bought by the English which had increased house prices beyond the means of many locals. The group were responsible for setting fire to English-owned holiday homes in Wales from 1979 to the mid-1990s. In the first wave of attacks, eight holiday homes were destroyed in a month, and in 1980, Welsh Police carried out a series of raids in Operation Tân. Within the next ten years, some 220 properties were damaged by the campaign. Since the mid-1990s the group has been inactive and Welsh nationalist violence has ceased. In 1989 there was a movement that protested an influx of Swabians to Berlin who were deemed as gentrification drivers. Berlin saw the Schwabenhass and 2013 Spätzlerstreit controversies, which identified gentrification with newcomers from the German south.