OTTAWA - Two more union leaders are accusing Liberal Leader Justin Trudeau of hypocrisy on labour rights.

Unifor national president Jerry Dias and CLC president Hassan Yussuff have joined the chorus of union leaders who are furious that Liberals have criticized New Democrats for providing parliamentary office space to their staffers' union local.

They've sent letters to Trudeau denouncing the Liberal move, following the lead of three other unions -- the United Food and Commercial Workers, United Steelworkers and Canadian Union of Public Employees.

In his letter, Dias says Liberal House leader Dominic LeBlanc's denunciation of the practice is "completely unacceptable" and leaves the impression that "workers' rights can be disregarded in the cause of cheap political theatre."

Yussuff says LeBlanc's criticism "doesn't square" with Trudeau's recent efforts to court the labour movement.

Both argue, as other union leaders have done, that it is common practice to negotiate collective agreements that require employers to provide office space for the union locals representing their workers.