Soviet threats to withdraw support were the main reason why reformists didn't expel the hardline Stalinist minority (Taistoists, after Taisto Sinisalo; the word "taisto" also means "battle" or "fight"; the double connotation made this slur, originally launched by the largest Finnish newspaper Helsingin Sanomat, stick) from the party leadership or membership.
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At its time, SKDL was one of the largest leftist parties in Western Europe, with its main member party, the Communist Party of Finland, being one of the largest communist parties west of the Iron Curtain.
An important trend in several countries in Western Europe from the late 1960s into the 1980s was "Eurocommunism." It was strongest in Spain's PCE, Finland's party and, especially in Italy's PCI, where it drew on the ideas of Antonio Gramsci.