Populism is a range of political stances that emphasize the idea of the common people and often position this group in opposition to a perceived elite group. It is frequently associated with anti-establishment and anti-political sentiment. The term developed in the late 19th century and has been applied to various politicians, parties and movements since that time, often as a pejorative. Within political science and other social sciences, several different definitions of populism have been employed, with some scholars proposing that the term be rejected altogether.
https://en.wikipedia.org/wiki/Populism