The ORGANIZATION@1 contained the regular , public police force of Soviet LOCATION@1 and the LOCATION@2 -LRB- including traffic police , firefighting , border guards and archives -RRB- but is better known for the activities of the Gulag and the ORGANIZATION@2 -LRB- GUGB -RRB- , which eventually became the ORGANIZATION@3 -LRB- ORGANIZATION@4 -RRB- .

The ORGANIZATION@1 is best known for the ORGANIZATION@2 -LRB- GUGB -RRB- , which came after the ORGANIZATION@5 and the LOCATION@3 as the secret police agency of the LOCATION@4 , and which became ORGANIZATION@4 .
