Call it a New Deal — in reverse. Argentina’s new president, Javier Milei, is hitting the ground running with what a top adviser calls an “overhaul of the economic power structure.” Yet while FDR’s first 100 Days were infamous for expanding government, inflating the currency, and stifling economic liberty, Mr. Milei’s ambitions are the opposite. His program offers “sweeping reforms to reduce the hand of the state in Argentina’s economy,” as Bloomberg puts it.

The goal, economist Federico Sturzenegger says, is to pivot from the stagnant statism of Perónism and “radically transform the South American nation.” Yet the left is already mobilizing to stop Mr. Milei’s reforms — backed by Argentine voters in a landslide election victory — dead in their tracks. The nation’s most powerful union, the General Confederation of Labor, has set for January 24 a general strike intended to bring the nation’s economy to a halt.