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“One device used by fascist parties, but also by Marxist revolutionaries who have given serious thought to the conquest of power, was parallel structures. An outsider party that wants to claim power sets up organizations that replicate government agencies. The Nazi Party, for example, had its own foreign policy agency that, at first, soon after the party had achieved power, had to share power with the traditional Foreign Office. After its head, Joachim von Ribbentrop, became foreign minister in 1938, the party’s foreign policy office increasingly supplanted the professional diplomats of the Foreign Office. A particularly important fascist “parallel organization” was the party police. Fascist parties that aspired to power tended to use their party militias to challenge the state’s monopoly of physical force.

The fascist parties’ parallel structures challenged the liberal state by claiming that they were capable of doing some things better (bashing communists, for instance). After achieving power, the party could substitute its parallel structures for those of the state.”
― Robert O. Paxton, The Anatomy of Fascism