Task: Question Answering
Input (English): Passage: On 5 March 1953, Joseph Stalin died, ushering in a period of moderate liberalization, when most European communist parties developed a reform wing. In Hungary, the reformist Imre Nagy replaced Rákosi, "Stalin's Best Hungarian Disciple", as Prime Minister. However, Rákosi remained General Secretary of the Party, and was able to undermine most of Nagy's reforms. By April 1955, he had Nagy discredited and removed from office. After Khrushchev's "secret speech" of February 1956, which denounced Stalin and his protégés, Rákosi was deposed as General Secretary of the Party and replaced by Ernő Gerő on 18 July 1956. Radio Free Europe (RFE) broadcast the "secret speech" to Eastern Europe on the advice of Ray S. Cline, who saw it as a way to, "as I think I told [Allen Dulles] to say, 'indict the whole Soviet system'."On 14 May 1955, the Soviet Union created the Warsaw Pact, binding Hungary to the Soviet Union and its satellite states in Central and Eastern Europe. Among the principles of this alliance were "respect for the independence and sovereignty of states" and "non-interference in their internal affairs".In 1955, the Austrian State Treaty and ensuing declaration of neutrality established Austria as a demilitarised and neutral country. This raised Hungarian hopes of also becoming neutral and in 1955 Nagy had considered "the possibility of Hungary adopting a neutral status on the Austrian pattern".In June 1956, a violent uprising by Polish workers in Poznań was put down by the government, with scores of protesters killed and wounded. Responding to popular demand, in October 1956, the government appointed the recently rehabilitated reformist communist Władysław Gomułka as First Secretary of the Polish United Workers' Party, with a mandate to negotiate trade concessions and troop reductions with the Soviet government. After a few tense days of negotiations, on 19 October the Soviets finally gave in to Gomułka's reformist demands. News of the concessions won by the Poles, known as Polish October, emboldened many Hungarians to hope for similar concessions for Hungary and these sentiments contributed significantly to the highly charged political climate that prevailed in Hungary in the second half of October 1956. 
Question: What is the first name of the person who was removed from office by April of 1955??
Output (English): Imre.