я не знаю, кого

I don't know who

→ я
phrase Rare #33,874
I don't know who Introduces a person the speaker does not know or does not know what to do with. Кого is the accusative form of кто and is used for people, often before an infinitive or a verb clause.
RU: Я не знаю, кого пригласить на вечеринку.
EN: I don't know who to invite to the party.

Я не знаю, кого они ищут.

I don’t know who they’re looking for.

Я не знаю, кого вы хотите видеть.

I don't know who you want to see.

Я не знаю, кого она ищет.

I don't know who she's looking for.

Я не знаю, кого винить.

I don't know who to blame.

Я не знаю, кого он ищет.

I don't know who he's looking for.