Two of the cases we use in English are nominative, used for subjects of sentences and clauses; and objective, (a combination of accusative and dative used in other languages). We use the objective case for direct and indirect objects. This comic is rather low-brow, but I approve of the title.
https://www.gocomics.com/bozo/2021/08/08
“Who” is nominative. It’s the subject of the sentence. “Whom” is objective; its the direct object.
