Nineteen-year-old Michael Delaney died after being run over by a truck in east London on a Saturday night in January 1987.
An inquest jury found that he had been a victim of unlawful killing. But nobody has ever been prosecuted.
Delaney had been among trade unionists picketing the Rupert Murdoch-owned News International plant at Wapping against the sacking of more than 5000 workers and the de-recognition of unions.
