During the winter of 1947–48, both in the cabinet and in parliament tension between the Communists and their opponents led to increasingly bitter conflict. Matters came to a head in February 1948, when Nosek illegally extended his powers by attempting to purge remaining non-Communist elements in the National Police Force.
Nosek, backed by Gottwald, refused to yield. He and his fellow Communists threatened to use force and, in order to avoid defeat in parliament, mobilised groups of their supporters in the country. On 21 February, twelve non-Communist ministers resigned in protest after Nosek refused to reinstate eight non-Communist senior police officers despite a majority vote of the cabinet in favour of doing so.
On 25 February 1948, Beneš, fearful of civil war and Soviet intervention, capitulated. He accepted the resignations of the non-Communist ministers and appointed a new government in accordance with KSČ (Communist Party of Czechoslovakia) demands.