The Council of Trade Unions is planning rallies throughout the country to challenge what it calls radical changes to employment law.
Submissions close on 25 July on the Employment Relations Amendment Bill, which brings several changes. Employers will be allowed to walk away from collective bargaining if negotiations stall and workers will no longer be automatically covered by a collective agreement for their first month of employment.
The Council of Trade Unions says that will undermine the way unions negotiate with businesses and lead to lower wages.
Business New Zealand says the union campaign will struggle to make the changes look radical, as they are in fact very reasonable.