What was the nickname of the plutonium implosion bomb

So i need to know the answer to thisi

Mao zedong called for the cultural revolution because he believed reforms threatened social equality

“from stettin i the baltic to trieste in the adriatic, an iron curtain has descended across the continent? ” the term iron curtain refers to which of the following? a. a military operation b. communism c. hard-line politics d. machine-driven battles e. unyielding diplomacy