Populism is a contested concept, used to refer to a variety of political stances that emphasize the idea of the common 'people' and often position this group in opposition to a perceived 'elite'. 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 assuming a pejorative tone.
https://en.wikipedia.org/wiki/Populism