This leader received the “Letter of three hundred” from scientists decrying a decline in biology research. This leader had Machine-Tractor Stations rapidly closed and forced farmers to buy the leftover equipment. A visit to the Iowa farm of Roswell Garst (-5[2])inspired this leader to grow new hybridized corn (-5[1])breeds in his country, which largely failed due to climate differences with the US. This leader recruited Komsomol volunteers to move to new farms in the Virgin Lands program. At the 20th Congress, this leader gave (10[1])a speech titled “On the Cult of Personality and Its Consequences” that denounced his predecessor and signaled the beginning of a relaxation of censorship called this leader’s “Thaw.” For 10 points, what Soviet leader gave the “Secret Speech” (10[1])and succeeded Joseph Stalin? ■END■ (10[1])