"Entryism" aka Infiltration, the "French Turn," "Boring-from-Within"

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Roughly analogous to: the long march through the institutions.

Democratic Socialist Organizing Committee is noted for its "realignment" strategy efforts within the Democratic Party in the 1970s, while its modern-day successor Democratic Socialists of America is primarily focused on running its members on the Democratic Party platform (e.g. Alexandria Ocasio-Cortez and Rashida Tlaib), or endorsing other democratic socialists at doing so (e.g. Bernie Sanders).