Jeremy Corbyn has laid out his hopes for campaigns he will promote when the Labour leadership contest is over.
He told a rally in Brighton that he wanted people to come together and join him in defending the NHS, pressing for decent jobs and for a fairer, more equal society.
In the 36th rally of his leadership campaign, he received a standing ovation from hundreds of his supporters, many of whom are attending the TUC Congress.
He hit out at the "grotesque" inequality in the country, saying: "We need to bring people together in order to create real social justice, real opportunities and the values that go with it."
Mr Corbyn, favourite to be re-elected leader when the result is announced on September 24, said he was proud that Labour's membership had grown to half a million, with 300,000 joining since he was elected leader a year ago.
He received huge applause when he pledged to renationalise the railways and try to halt controversial plans for grammar schools.
Mr Corbyn also talked of building half a million council houses over five years to tackle the housing crisis.
Dave Ward, general secretary of the Communication Workers Union, told the rally that Jeremy Corbyn was the most popular Labour leader in the party's history.
"He just gets stronger and stronger the more people attack him - even the Boundary Commission is trying to unseat him.
"I call it Jeremy's curse because every time someone takes him on they have to resign. Even David Cameron has gone."
Mark Serwotka, general secretary of the Public and Commercial Services union, who is in hospital waiting for a heart transplant, sent a message to the rally.
"Being in hospital, and being looked after by wonderful junior doctors, just brings into focus how important it is to defend our NHS. And we need a united Labour Party and united Labour movement to do that.
"It is absolutely crucial that Jeremy wins."