What torture technique did the successor of the Cheka agency use?
Tean zu: Tean zu () is one technique of torture that was used in ancient China. Tean zu:  The Soviet KGB used a variant of this for crushing fingers or toes. KGB: The KGB, an initialism for Komitet Gosudarstvennoy Bezopasnosti (Russian: "Комите́т Госуда́рственной Безопа́сности" ("КГБ") ; ] ), translated in English as Committee for State Security, was the main security agency for the Soviet Union from 1954 until its break-up in 1991, as a direct successor of such preceding agencies as Cheka, NKGB, NKVD and MGB, a committee was attached to the Council of Ministers.
Tean zu