The incident took place at Birupur village when the tractor lost control and overturned trapping the three labourers under it while they were digging earth and loading it in the vehicle, Barahia police station in-charge Pramod Kumar Singh said.
While two labourers, identified as Pravesh Mahto (30) and Umesh Sao (40) died on the spot, Indradev Mahto was injured.
The injured was taken to a referral hospital, Singh said.
Efforts were on to extricate the two bodies trapped under the tractor.
The district magistrate has rushed an officer to the spot, Singh said.
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