Why is Abhishek Banerjee's wife being summoned by CBI in coal smuggling probe?

The CBI has summoned TMC MP Abhishek Banerjee's wife Rujira Banerjee to join its probe in the alleged coal smuggling case.

A team CBI team on Saturday reached the residence of Abhishek Banerjee, who is the nephew of West Bengal Chief Minister Mamata Banerjee, to summon his wife in the coal smuggling probe.