on predicate member of political party sorted by label

Subject	Predicate
?:Bruno Trentin	?:member of political party
?:Demetrio Volcic	?:member of political party
?:Elena Ornella Paciotti	?:member of political party
?:Giorgio Napolitano	?:member of political party
?:Giovanni Berlinguer	?:member of political party
?:Massimo Carraro	?:member of political party
?:Nilde Iotti	?:member of political party
?:Pier Luigi Bersani	?:member of political party
?:Sergio Cofferati	?:member of political party