 The more leftist members of the Democrat Party became involved in the leadership of labor unions and broke off to launch the Socialist Workers' Party ( – POS) in 1912.The founder of the POS and its best-known leader, Luis Emilio Recabarren, also founded the Communist Party of Chile ( – PCCh) in 1922.By the 1920s, the emerging middle and working classes were powerful enough to elect a reformist president, Arturo Alessandri Palma.