Ed Miliband has set out a series of reforms designed to reshape Labour's relationship with the trade unions and end the "machine politics" behind the alleged ballot-rigging controversy in Falkirk.
In changes which could provoke a major clash with the union bosses who bankroll his party, Mr Miliband said he would reform the system of affiliating union members to Labour.
He also said he would introduce a code of conduct for would-be election candidates and introduce open primary elections for Labour's next candidate for London Mayor.
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The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants