The Hacked Off campaign, which represents many victims of newspaper intrusion, said Lord Justice Leveson had given the Prime Minister a "workable, proportionate, reasonable solution" to the problems of press abuse.
But the group added that David Cameron "had not done his job" by failing to accept the full recommendations of the report and was wrong to trust Editors to "behave themselves".
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The 88-year-old had faced trial in a litany of cases ranging from corruption to the killing of protesters.
A man who met PC Keith Palmer said his murder "sent a shiver down my spine".
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