MUNICH — Rep. Alexandria Ocasio-Cortez, D-N.Y., a progressive who made a name for herself focused on economic problems at home in the United States, might have seemed an odd fit for the Munich Security Conference, an annual gathering of foreign leaders and diplomats focused on international security.But at two Friday panels, she tied worsening income inequality to the rise of authoritarianism, weaving her working-class worldview into a broader message about combating far-right populism and strengthening relationships with Western allies. Everyday people, she argued, were turning away from democracy because wealthy elites had failed to address their needs. “Extreme levels of...