What has Labour done to support supermarket workers in their dispute?

The current industrial dispute in supermarkets is clearly one of the major union struggles of recent years. It's a still a strong possibility that these very low paid workers could lose, as they won't have the funds to withstand a protracted battle against a major Australasian company that made makes over a billion dollar profit each year. This raises the question of whether NZ unions should be building up strike funds instead of wasting money on the Labour Party. It should be obvious that Labour aren't particularly interested in the lot of such workers. What has Labour done to support workers in this dispute? Nothing of much relevance. Instead they've merely retained much of the anti-worker laws that were in the Employment Contracts Act - in particular the anti-strike provisions. This makes it particular clear that the Service and Food Workers Federation wasted the $240,000 they spent in support of Labour in the last election.