Detective Chief Superintendent Gordon Briggs, is overseeing the inquiries into phone hacking, corrupt payments and other privacy breaches.
Speaking outside court, after a senior counter-terrorism detective was found guilty of offering to leak information to the News of The World on the phone-hacking inquiry, he said.
It's totally unacceptable for a serving police officer to leak confidential information to journalists for private gain. In doing so they let down the public and they let down their hard-working honest colleagues.
To act in that way is a gross breach of public trust. I hope today's verdict demonstrates our commitment to rooting out this kind of corruption and demonstrates that corruption of this kind will not be tolerated in the Metropolitan Police Service.
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As the silence came to an end the crowd began to applaud and people shouted "I am not afraid!" in defiance of the attacks.