What is the ruling on working for brokerage firms dealing in securities and for usurious banks in Gaza, in light of the lack of job opportunities, rising unemployment and poverty, and the severity of the blockade?

Working in usurious banks is unlawful (haram), as is working in financial brokerage firms if it involves purchasing shares of usurious banks. However, if a person is compelled to work in these prohibited jobs, there is no impediment until they find a permissible alternative. Necessity is estimated by its extent, and "But whoever is compelled, being neither disobedient nor exceeding due limits, there is no sin upon him. Indeed, Allah is Forgiving and Merciful" (Quran 2:173). The definition of necessity is that it is highly probable that one would perish or suffer unbearable hardship, or be unable to secure the minimum necessities of life because of it.