克格勃在冷战期间是苏联最强大的情报机构。

The ___KGB was the most powerful intelligence agency of the Soviet Union during the Cold War.

那个校长管理学校的方式就像克格勃一样，连学生的私人日记都要检查。

The principal ran the school like the ___KGB, even inspecting students' private diaries.