The GMB Congress has banned its members from visiting Israel and the Palestinian territories on Trade Union Friends of Israel-organised delegations.
Union members at the annual congress in Plymouth voted through a motion which said funding for participants in trips should be stopped because TUFI opposes a boycott of Israel.
A TUFI spokesman said the decision was “disappointing”. He highlighted the GMB’s links to Labour, whose leader Ed Miliband also opposes boycotts.
● Delegates at the Northern Ireland Public Service Alliance annual conference dropped a planned boycott of Israel after discovering accusations about segregation of Palestinians were false.