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Sky News Senior Reporter Caroline Marcus explores the history of the Independent Commission Against Corruption and the extent of its operations in the NSW public sector.

Former Liberal Premier Nick Greiner established the state’s first anti-corruption body in 1988.

ICAC's key function is to expose and investigate corruption in the public sector.

The commission can receive reports of suspected corrupt conduct in the public sector from members of the public, public officials, NSW parliament or can also identify matters it thinks warrant investigation itself.

If a matter falls within its jurisdiction, it is referred to an assessment panel made up of senior officers who will decide what – if any – action to take.

In pursuing an investigation, ICAC can use its extensive legislated powers to gather evidence, which includes the use of covert methods such as phone taps.

When ICAC decides to pursue an inquiry, it can compel witnesses to appear, answer questions and produce documents.

At the conclusion of that inquiry, the commission will table a report to parliament, which may contain recommendations to refer any corruption findings to the NSW Director of Public Prosecutions to consider criminal charges.