The Party for Democracy (Partido por la Democracia or PPD) is a centre-left political party in Chile. It states to stand in the traditions of democratic socialism and liberal progressivism. It was founded in December 1987 by Ricardo Lagos, who aimed at forming a legal social democratic party (the Socialist Party remained illegal at the time). The party continued to function after the defeat of Pinochet. Until 1997, double membership of PPD and the Socialist Party was allowed.