Police are reviewing charges against more than 120 protesters who participated in a blockade of the world's largest port after four activists were acquitted in court.

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Hordes of people descended on the Port of Newcastle in November to call on the federal government to rule out new coal and gas mines, and introduce a 78 per cent tax on coal and gas exports.

More than 170 people were arrested during the multi-day event, which organisers Rising Tide hailed as the largest single act of civil disobedience in Australia's history.

Four of the activist

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