Wharfies took fresh hope from a noisy protest march in Auckland as industrial action spread to Australia and threatened to leap to the United States.
About 3500 workers and their supporters marched the length of the Auckland waterfront to voice their opposition at the sacking of 300 Ports of Auckland staff last week.
They were joined by unionists from across the country and some who had travelled from Australia and the US.
In Sydney yesterday, wharfies went on strike in a show of solidarity with the Maritime Union of New Zealand workers.
International Transport Workers Federation representative Ray Familathe - representing dock workers on the West Coast of the US - said international support was strong and industrial action could spread. "We're going to look at all means of support possible."