sentences:  Xander den Uyl became a leading figure in ABVAKABO, one of the Dutch labour unions and serves as Member of the Provincial-Council of North Holland for the Labour Party since 2011.After the elections of 1986, in which the Labour Party won 5 seats but failed to retain its position as largest party, Den Uyl left politics.He was succeeded as leader of the Labour Party by Wim Kok.