Q: Does Islam allow to sell grocery products to bankers?
A. Yes, it is permissible to sell goods to bankers as it is permissible to sell goods to other Kuffaar. Rasulullah (Sallallaahu Alayhi wa Sallam) and the Sahaabah did trade with Jews and idol-worshippers, and we know that these people indulged in usury and Ribaa. The Holy Qur'aan did not prohibit this.
Mufti Siraj Desai