Some parts of Operation Sayeed were Operation Steel Curtain and Operation Iron Fist .

Metallica also became Becoming the first band of the Big Four to cross the Iron Curtain , with two concerts Social_event in Katowice , Poland on February 10 and 11 , 1987 .

Also in June 1989 , Hungary began Process_start dismantling its section of the physical Iron Curtain , leading to an exodus of East Germans through Hungary , which destabilized East Germany .

This was the second time the band traveled Traveling behind the Iron Curtain .