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In page Demographics of Sweden:

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During the 1950s and 1960s, the recruitment of immigrant labour was an important factor of immigration. The Nordic countries signed a trade agreement in 1952, establishing a common labour market and free movement across borders. This migration within the Nordic countries, especially from Finland, was essential to create the tax-base required for the expansion of the strong public sector now characteristic of Scandinavia.[citation needed] but the influx gave rise to an anti-Finnish sentiment within Sweden and Norway. This continued until 1967, when the labour market became saturated, and Sweden introduced new immigration controls.