1 Question: A person has entered a country as a visitor and his passport was stamped that he was not allowed to work. If he works illegally and gets the money 'under the table', is it halal?
Answer: If the visa was granted against an undertaking that the person should not engage in any sort of employment during the period of his stay in the country, his infringement of the undertaking is Haram. However, this should not deny him the wages for the work; it is permissible that he has the right of disposal over it as he deems fit.
2 Question: Is it permissible for a Muslim to give false information to government departments in Europe to gain some financial or abstract benefits, through proper channels?
Answer: It is not permissible because it is lying.
3 Question: Is it permissible to steal from the unbelievers in their countries, or defraud them?
Answer: It is not permissible to steal from their private and public property, nor is it permissible to cause any damage to such property, since the said acts could tarnish the reputation of Islam and Muslims in general. Notwithstanding the above, it is not permissible, for it amounts to treachery and breach of implicit trust, when applying for entry visa or residence. Treachery and breach of trust directed against anybody is Haram.