Wladyslaw Gomulka (Polish: [vwa'diswaf go'muwka]; 6 February 1905 - 1 September 1982) was a Polish communist politician. He was the de facto leader of post-war Poland until 1948. Following the Polish October he became leader again from 1956 to 1970. Gomulka was initially very popular for his reforms; his seeking a "Polish way to socialism"; and giving rise to the period known as "Gomulka's thaw".

The reformers in the Party wanted a political rehabilitation of Gomulka and his return to the Party leadership. Gomulka insisted that he be given real power to implement further reforms. He wanted a replacement of some of the Party leaders, including the pro-Soviet Minister of Defense Konstantin Rokossovsky.  The Soviet leadership viewed events in Poland with alarm. Simultaneously with Soviet troop movements deep into Poland, a high-level Soviet delegation flew to Warsaw. It was led by Nikita Khrushchev and included Mikoyan, Bulganin, Molotov, Kaganovich, Marshal Konev and others. Ochab and Gomulka made it clear that Polish forces would resist if Soviet troops advanced, but reassured the Soviets that the reforms were internal matters and that Poland had no intention of abandoning the communist bloc or its treaties with the Soviet Union. The Soviets yielded.  Following the wishes of the majority of the Politburo members, First Secretary Ochab conceded and on 20 October the Central Committee brought Gomulka and several associates into the Politburo, removed others, and elected Gomulka as first secretary of the Party. Gomulka, the former prisoner of the Stalinists, enjoyed wide popular support across the country, expressed by the participants of a massive street demonstration in Warsaw on 24 October.  A major factor that influenced Gomulka was the Oder-Neisse line issue. West Germany refused to recognize the Oder-Neisse line and Gomulka realized the fundamental instability of Poland's unilaterally imposed western border. He felt threatened by the revanchist statements put out by the Adenauer government and believed that the alliance with the Soviet Union was the only thing stopping the threat of a future German invasion. The new Party leader told the 8th Plenum of the PZPR on 19 October 1956 that: "Poland needs friendship with the Soviet Union more than the Soviet Union needs friendship with Poland... Without the Soviet Union we cannot maintain our borders with the West". Seeing that Gomulka was popular with the Polish people, and given his insistence that he wanted to maintain the alliance with the Soviet Union and the presence of the Red Army in Poland, Khrushchev decided that Gomulka was a leader that Moscow could live with. The treaty with West Germany was negotiated and signed in December 1970. The German side recognized the post-World War II borders, which established a foundation for future peace, stability and cooperation in Central Europe.  In 1967-68 Gomulka allowed outbursts of "anti-Zionist" political propaganda, which developed initially as a result of the Soviet bloc's frustration with the outcome of the Arab-Israeli Six-Day War. It turned out to be a thinly veiled anti-Semitic campaign, pursued primarily by others in the Party, but utilized by Gomulka to keep himself in power by shifting the attention of the populace from the stagnating economy and mismanagement. The result was the emigration of the majority of the remaining Polish citizens of Jewish origin. At that time he was also responsible for persecuting protesting students and toughening censorship of the media. Gomulka was one of the key leaders of the Warsaw Pact and supported Poland's participation in the intervention in Czechoslovakia in August 1968.Answer this question using a quote from the following article:

Why did the Soviet leadership view events in Poland with alarm?
He wanted a replacement of some of the Party leaders, including the pro-Soviet Minister of Defense Konstantin Rokossovsky.