0 abbreviation for the Social and Democratic Labour Party: a political party in Northern Ireland that supports union with the Republic of Ireland by peaceful methods --
1 abbreviation for Social Democratic and Labour Party: a political party in Northern Ireland that wants Northern Ireland to become part of the Republic of Ireland: --
Hume represented the SDLP in the old Northern Ireland Parliament.
SDLP and Sinn Fein compete for votes in the nationalist community.