The leader of the UK's biggest trade union has said the country is "riven" as a result of the EU referendum.
Len McCluskey, general secretary of Unite, is expected to tell the union's party conference in Brighton: "I can never recall the supreme policy-making body of our union convening in such turbulent times, and with such a weight of responsibility upon its shoulders".
McCluskey will address the split in the Labour party on Monday, and will warn jobs are in jeopardy and long-established rights could be under threat.
"We must condemn with all the force we can muster the disgusting upsurge of racist attacks on migrants and black Britons alike undertaken by racists emboldened by the referendum result", he will add.
Mr McCluskey has been trying to heal the "bitter and unnecessary" rift between Labour MPs and leader Jeremy Corbyn, but a planned meeting on Sunday between union leaders and Mr Corbyn was called off by deputy leader Tom Watson.
In a statement, McCluskey said: "When the possibility of a workable plan had never seemed closer, Tom Watson's actions can only look like an act of sabotage fraught with peril for the future of the Labour Party."