Because of the Seven "C"s: Cult of personality, Communism, China, Cuban Crisis, Corn, and Cuzka's mother (In Russian, this is the seven "K"s. To "show somebody Kuzka's mother" is a Russian idiom meaning "to give somebody a hard time". Khrushchev had used this phrase during a speech at the United Nations General Assembly, allegedly referring to the Tsar Bomba test over Novaya Zemlya).
He organised a protest on 1 November 1961 in which he delivered a milk bottle labelled "Danger — Radioactive" to the Soviet Union embassy in London in protest at the detonation of Tsar Bomba, at 50 megatons the largest nuclear explosive to ever be tested.
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The series included the most powerful bomb ever tested, the 50-megaton (50,000 kt) "Tsar Bomba", which was detonated over Novaya Zemlya.