The Czechoslovak coup d'état of 1948 took place on 25 February 1948. Joseph Stalin soon tried to pressure Norway to sign a treaty of mutual assistance. The coup also affected Norwegian interior politics. On 29 February 1948 Prime Minister Einar Gerhardsen held the Kråkerøy Speech in which he denounced the Communist Party of Norway as possible supporters of a Czechoslovak-like coup d'état in Norway. The Communist Party supported the Czechoslovak coup d'état. Shortly after Gerhardsen's speech, at least 1,500 people demonstrated in Oslo against the coup. Norway joined the NATO in 1949. During the Cold War, the Czechoslovak intelligence StB spied in Norway as an instrument of the KGB, and the Norwegian Intelligence Service spied in Czechoslovakia as an instrument for the Central Intelligence Agency. In both cases, the intelligence service of the small nation was used because it was less conspicuous than the intelligence service of the superpower. The StB was interested in informants from the Czechoslovak diaspora, from people involved with NATO and from politicians in the Norwegian Labour Party and from 1961 the Socialist People's Party. Among the people convicted as spies, was the Czechoslovak former media celebrity Vladimír Veselý. He was sentenced to 25 years of prison in 1957. Veselý had allegedly had contact with Norwegian intelligence officerEinar Nord Stenersen, who had been dispatched to the Norwegian embassy in 1954.
Cold War cultural exchange
Norwegian puppeteer Birgit Strøm married Czechoslovak diplomat Jan Bureš in the early 1950s. Bureš was summoned back to Czechoslovakia for marrying a westerner, and even though Strøm followed him to Prague, the marriage was dissolved. Both Bureš and Strøm were surveilled by StB. Strøm returned to Norway, but had made lasting bonds with the Czech puppeteering scene. Some emigrated to Norway, including Karel Hlavatý who is known for physically crafting Strøm's puppet character Titten Tei. For having contacts in an Eastern European country, Strøm was also extensively surveilled by Norwegian intelligence. The Norwegian Broadcasting Corporation, for many years the only television channel in Norway, imported a fair amount of Czech television, especially children's shows. Recurring shows include Zdeněk Miler's series about Mole, Beneš and Jiránek's Pat & Mat, Beneš' Jája a Pája and Čtvrtek and Pilař's Cipísek. Preußler and Smetana's Malá čarodějnice from the mid-1980s was a Czechoslovak-German production. The Czechoslovak-German film from 1973, Tři oříšky pro Popelku, was first aired in Norway in 1975 and has been aired on 24 December every year since 1987 except for 1993 and 1995. The Norwegian version features a single, overdubbed voice for the narrator and all characters which is uncommon in Norwegian television. Norwegians who were decorated for contributions to Czechoslovak culture include Kjell Bækkelund, who received the Janáček Medal.