Operation Tân

Operation Tân (Welsh pronunciation: [ˈtɑːn], "fire") was the name of a series of police raids in Wales between 1 October 1979 and 30 September 1980. The aim of the operation was to identify members of Meibion Glyndwr, a Welsh Nationalist group responsible for burning English Holiday homes within the Welsh countryside

It has been criticised as a more generalised trawl of left and nationalist milieux within Wales.