Victoria Police has been spending millions of dollars on a secret operation to keep lawyer-turned-informer Nicola Gobbo silent and hidden within Australia.

Ambulance Victoria will investigate after a man who was critically ill waited almost six hours for paramedics, as growing service delays continue to plague the state.

Ratepayers across Victoria complained to councils almost 70,000 times about illegally dumped rubbish in their neighbourhoods.

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La Trobe University is facing fresh underpayment claims that could force the university to back pay its casual staff millions more dollars after forking out more than $3 million in stolen wages last year.