Giving zakaah to an organization so that they will distribute the zakaah to the needy

If you take
of it yourself and give it directly to one who is entitled to it according
to your understanding, then you will be sure that it has gone to the right
place. If you agree to give it to someone whom you trust to dispose of it
in the manner prescribed in Islam, this is also permissible.

Fataawa
al-Lajnah al-Daa’imah, 9/457

Shaykh Ibn Baaz said: If
the people who are doing that are trustworthy and honest, and will dispose
of the zakaah in the ways prescribed in sharee’ah, then it is OK to give
one’s zakaah to them, because this is a way of co-operating in righteousness
and piety.

Fataawa
al-Shaykh ‘Abd al-‘Azeez ibn Baaz, 3/126 .