How did the iron curtain tighten the soviet union’s hold over eastern europe?

The iron curtain was like a curtain. It separated parts of Europe and was hard to escape the communism. 

The  pan-african movement  was an "emotional, cultural, psychological and ideological  movement  that began among the  african  dispora in the western hemisphere, for a closer  purpose, so that  african  people could feel secure, attain political, economic as well as psychological power visa vis other races or world regions" .