Derrick Dalley made the accusation Wednesday in the legislature as tempers flared over how crab prices are set in the province.
A price setting panel has set a price that the union says is too low.
Some members of the Fish, Food and Allied Workers union dumped thousands of kilograms of crab over a wharf in Hickman's Harbour earlier this week as the dispute escalated.
In the legislature, Dalley accused the union of telling lies and flip-flopping on important issues.
Dalley says he has met with the union and the Association of Seafood Producers, saying the union's actions in Hickman's Harbour were not acceptable.