The politicians are deliberately misusing funds. Pork barrel is misuse, generally.

And the extremely huge organizations that take the funds are not exactly misusing things themselves but they are facilitating the politicians.

No, that's pork barrel spending, which is a different thing, namely, a policy decision (that you perhaps disagree with) made within the confines of the law. Stop trying to get the word corruption to encompass "all decisions I disagree with." It's what people do when they're trying to make their disagreement into an ideological judgement, because that's what's more satisfying and exciting.

You're seriously saying it can't be misuse because it's legal?

It's been legal for congress members to inside trade, even. That doesn't make it acceptable. It's not just making decisions I "disagree with" that matter here.