In 1986, at the age of 23, Keir Starmer participated in a work camp in Czechoslovakia, where he and other international volunteers helped restore a memorial in Lidice, a village destroyed by the Nazis in 1942. According to reports, the camp was monitored by the Czech secret service (StB), which collected personal details of participants, including Starmer's.
According StB - (Státní bezpečnost) documentation.
The StB (Státní bezpečnost) was the state security service of communist Czechoslovakia, operating as an intelligence agency and secret police. During the Cold War, the StB documented individuals and events in meticulous detail, particularly when foreigners were involved, as part of its surveillance and intelligence-gathering efforts.
Purpose of the records: The StB routinely monitored foreign visitors for potential intelligence value or ideological influence. The work camp Starmer attended, being an international gathering, was naturally of interest to the StB.
--------------------------------------------------------------------------------------------------------------
Further to the above - KeyWiki Keir Starmer :
https://keywiki.org/Keir_Starmer