"Protest rallies will be taken out in all state capitals and in Delhi as the proposed reforms are against the interest of the working class," general secretary of All India Trade Union Congress (AITUC) Gurudas Dasgupta said.
"The reforms are pro-corporate and anti-worker. The reforms will give rise to low wages and negligible security cover to the workers. A worker can be hired at will and thrown out," he said.
After the proposed amendments, 70 per cent of small and medium enterprises will remain out of the purview of the labour laws, he added.
Union leaders said with the end of the inspection raj, companies who are not implementing the labour laws will stand to benefit the most.
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Left parties such as CPI(M) have already slammed the reform measures, saying the Modi government would continue to serve the interests of the employers in the name of labour reforms and its 'Shramev Jayate' programme meant "nothing much" for the working class.
The unions are also opposing disinvestment of PSUs and allowing FDI in defence production, railways and insurance, said Centre of Indian Trade Unions (CITU) president A K Padmanabhan.