The Communist Party of Britain's 40th annual congress took place in 1989 in his London constituency of Islington North, six years after he was first elected to Parliament as a Labour MP.
It came just months after Communist China's army killed pro-democracy protestors in Tiananmen Square.
Organisers of the London gathering which included delegates from around the world wanted Communists to devise a way to remind "working men and women" of the "role of the Marxist-Leninist" party.
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This shows yet again that Jeremy Corbyn is simply not fit to be Prime Minister
A photograph in the Communist Party of Britain's official report of the convention showed the future Labour leader in front of a banner bearing the party's hammer and sickle symbol.
According to "socialist" newspaper the Morning Star, Mr Corbyn "pledged his unwavering commitment to unilateral disarmament, declaring that 'we can make a start and set an example by removing all nuclear weapons from this country'".
He also reportedly spoke of a pressing need for Britain to leave Nato, "highlighting the obscenity of the £20billion-a-year spent on arms by this country".
Jeremy Corbyn in front of a banner bearing the party's hammer and sickle symbol
The MP was loudly applauded as he called for an escalation of campaigns to free what the paper called "Irish victims of legal injustice", as he hailed the release of the Guildford Four who had just been released after a court quashed their convictions for bombing the Surrey town in 1974.
Mr Corbyn's views on Trident, Nato and the IRA are still sparking rows during this election campaign.
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The lifelong nuclear disarmament and peace campaigner has signalled a reluctance over renewing the current Trident arrangements although his party's manifesto commits a Labour government to do so.
He has said he would not “automatically” send troops to defend a Nato ally under attack.
'Retreat does not win victories, united advance does', Jeremy Corbyn said in 1989
And he has dodged calls specifically to condemn IRA violence, amid pressure to apologise for his close links to Irish republicans at the height of the Troubles.
Mr Corbyn's hard left views have convinced the Communist Party of Great Britain not to stand any candidates against Labour on June 8.
And he recently defended hiring an aide, Andrew Murray, who was a Communist party member until late last year and who in 2003 referred to Communists' basic principle of "solidarity" with “People’s Korea” – North Korea.
James Cleverly, a Conservative election candidate and Army reservist, said: "This shows yet again that Jeremy Corbyn is simply not fit to be Prime Minister.
Mr Corbyn's views have convinced the Communist Party of Great Britain not to stand any candidates
"He has been cosying up to Communists for years, and they would be by his side to disarm our military and abandon our allies if he makes it to Downing Street in just 12 days time.
"In an increasingly dangerous world, Corbyn's obsession with scrapping Trident and ditching Nato would weaken our security and encourage our enemies.
"But there is a real risk of this happening. The Government only needs to lose six seats and we will have a hung parliament with Jeremy Corbyn as PM propped up the SNP and Lib Dems, cheered on by the Communists.
"Only a vote for Theresa May and her local Conservatives can stop Jeremy Corbyn pursuing a Red Revolution in Britain: crashing our economy, giving in to the EU over Brexit, and dismantling our defences."
Mr Corbyn's views on Trident, Nato and the IRA are still sparking rows during this election campaign
Mr Corbyn last night declined to say he supported replacing the four submarines that carry Britain's nuclear deterrent and joining the US programme to extend the Trident missiles' lifetimes, although Labour's election manifesto commits the party to doing so.
"I voted against the renewal, everybody knows that," he told BBC One's Andrew Neil.
Pressed again to say he supported Trident renewal, he said: "We are going ahead with the programme which has been agreed by Parliament and voted on by the Labour Party."
Pressed again over his support, Mr Corbyn added: "Listen, my views on nuclear weapons are well known, I want to achieve a nuclear-free world through multilateral disarmament through the nuclear non-proliferation treaty."