Big 4 crackdown could see fines of $780m. Now its a matter of enforcement.

Title: Big 4 crackdown could see fines of $780m Caption: The fallout over the tax leak scandal at PWC is now engulfing all of the Big Four consulting firms which face massive fines if they promote dodgy schemes that exploit loopholes. The crackdown will also change secrecy laws which currently prevent the Tax Office from alerting police and regulators when unlawful activity is uncovered. Reporter: Senior Business Correspondent Peter Ryan Featured: Tom Ravlic, investigative journalist