ANSWER: If this is the only thing they do and the banks are conventional riba based, this is not permissible. 

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ANSWER: This is not permissible as it involves facilitating in two major sins:  Gambling and Riba.

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ANSWER: If one is working against Islam and Muslims, their salary is haram. Also, if they are taking cases and applying the rule of secular states, this is forbidden as one can only rule with the Islamic law except in cases that he is defending the rights of the oppressed and the likes.  

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