"We are sending a message to vicious employers in general that there are people that will stand up to this sort of rubbish,'' he said.
Mr McEnaney said the dispute was similar to a conflict firefighters fought in 1996, when negotiations with the Fire Service over contracts led to court action.
"It's not a very nice position to be in.
"This is not about fire fighters, though we're well aware the same thing could inevitably be happening to us. Tomorrow's support is for the port workers and their families.
"You've got to question the true fairness about it.''
National secretary of the New Zealand Public Services Association Richard Wagstaff said the support of the union movement comes as no surprise considering the ``extremely aggressive'' actions of the Ports of Auckland.
"We want people everywhere to understand that this issue is much bigger than the port - it's an issue for every worker.''
Mr Wagstaff said the port has been unbalanced and uncompromising in their negotiations with port workers.
"If the Ports of Auckland are successful, it will no doubt encourage other employers to think that kind of bargaining style is appropriate.
"[The workers] deserve all the support they can get.''
Ports of Auckland communications advisor Anne-Marie Petersen had no comment on tomorrow's rally.
The Maritime Union told the Ports of Auckland this week that it planned on extending the 235 member strike by 14 more days, to six weeks.
This follows the port's decision on Wednesday to make redundant almost 300 workers, including hundreds of strikers, and replace them with contractors.
The Union has made an application to the Employment Court, asking for a ruling on the port's decision.
A six-week consultation period for the redundancy process starts today.