Subject | Direct Object | Indirect object | Possessive
he | him | to him | his
they | them | to them | theirs
who | who | to whom | whose
As @tchrist pointed out, "the people who need" are the subject of the sentence, so it's who, not whom.
Whom is usually the indirect object of the sentence, as in
"To whom should I make this cheque payable".
When you have a direct object, it's usually who, as in
"He doesn't care who he hurts with his snarky comments".
According to this Oxford Dictionaries blogpost, whether to use who or whom for the direct object is in flux and a matter of personal preference.