This leader received the “Letter of three hundred” from scientists decrying a decline in biology research. (-5[1])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 inspired this leader to grow new hybridized corn breeds in his country, which largely failed due to climate differences (10[1])with the US. This leader recruited Komsomol volunteers to move to new farms in the Virgin Lands program. At the 20th Congress, (10[1])this leader gave 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” and succeeded Joseph Stalin? ■END■