"The longest suicide note in history" is an originally used by United Kingdom Labour Party MP Gerald Kaufman to describe his party's 1983 election manifesto, which emphasised socialist policies in a more profound manner than previous such documents.
The New Hope for Britain was a 39-page booklet which called for unilateral nuclear disarmament; higher personal taxation for the rich; withdrawal from the European Economic Community; abolition of the House of Lords; and the re-nationalisation of recently privatised industries like British Telecom, British Aerospace, and the British Shipbuilders Corporation. The manifesto was based on an earlier and much longer policy paper with a similar title, Labour's Plan: the New Hope for Britain.
The epithet referred not only to the orientation of the policies, but also to their marketing. Labour leader Michael Foot decided as a statement on internal democracy that the manifesto would consist of all resolutions arrived at its party conference.
The document's more left-wing policies, along with the popularity gained by Prime Minister Margaret Thatcher over the Falklands War and the division of the opposition vote between the left-wing Labour Party and the centre-left Social Democratic Party – Liberal Alliance, contributed to a victory with a substantial majority in Parliament for the incumbent right-wing Conservative Party. The defeat led to a turning point in the history of the party, which thereafter gradually moved to the centre under the leadership of Neil Kinnock and, under the leadership of Tony Blair presented itself as New Labour and a Third Way, leading to a landslide victory in the 1997 election.