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It's not the same party in Poland and Peru with different labels, they're completely distinct political forces which by historical accident converged into similar programmes at the same time. The Peruvians adopted their programme by evaluating the current situation in light of Marxism-Leninism, unlike the Poles. As the years pass and things change they'll think of something else, it'll still be in light of their leftist theoretical background but not necessarily similar to what their erstwhile Polish counterpart now thinks. Given regional precedents a hard leftward push is a perfectly plausible course of action for a party like that to take.