They described the move as "discriminatory" and "undermining the spirit of tripartism."
A letter to Labour Minister Santosh Gangwar by the unions said: "Your Ministry had invited nomination to the 47th ILC to be held on February 26-27. We have noted that INTUC, the second biggest central trade union in the country as per the official verification of your ministry, has not been extended invitation for the ILC, the highest tripartite forum of the country."
The letter said the ministry has taken a totally arbitrary stand regarding the hasty recognition of a breakaway faction of TUCC, another central trade union, ignoring the main one.
"So, the debarment of INTUC from the tripartite forums including ILC, we are forced to conclude, as politically vindictive," it added.
The unions expressed displeasure over not taking action on the unanimous recommendations of the 43rd, 44th and 45th ILCs especially on formulation of minimum wages, same wages and benefit for same work as regular workers for contract labour.
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