The definition of a tutor is a personal teacher, a teaching assistant or someone who helps a student catch up in a subject. An example of a tutor is someone who teaches a teenage celebrity. An example of a tutor is a teacher who assists a college professor with their teaching duties.
iron curtain-an impenetrable barrier to communication or information especially as imposed by rigid censorship and secrecy; used by Winston Churchill in 1946 to describe the demarcation between democratic and communist countries.
There are Iron Curtain monuments that stand as a reminder of a long-gone era. One is located in the Czech Republic and includes an original guard tower with signs explaining the origins and reasons for the Iron Curtain.