What political party is XXX a memeber of?
Adolfo López Mateos
Adolfo López Mateos (Spanish pronunciation: (aˈðolfo ˈlopez maˈteos); 26 May 1910 -- 22 September 1969) was a Mexican politician affiliated with the Institutional Revolutionary Party (PRI) who served as President of Mexico from 1958 to 1964.
Institutional Revolutionary Party