Technical auxiliary battalions (Czech: Pomocné technické prapory, PTP, Slovak: Pomocné technické prápory) or forced labor military camps (Czech: Vojenské tábory nucených prací, VTNP) were units of the Czechoslovak People's Army active from 1950 to 1954[1] in Czechoslovakia for the internment and re-education of persons considered disloyal.
An important reason for its creation was also securing cheap labour for selected industries, mainly mining and construction.
A number of Czech and Slovak sportsmen, who were labelled as the „unreliable“, also worked, as the “Black Barons”, at constructions projects.
Miloslav Švandrlík's novel "Černí baroni" ("Black Barons"), published in 1969 and made into a film of the same name in 1992 and into a TV series in 2004, provided a lasting memory on a broad scale.
On the square in the center of the village, a memorial stone commemorates the members of the Technical Auxiliary Battalions.