This is the 3002nd most frequent Korean word.
특검을
"특검을" means "special prosecutor" or "independent counsel" in English, referring to an appointed investigator for specific cases.
'특검을' is the object of the verb '요청했어요' (requested), indicating what was requested - here, a special investigation.
그는 특검을 요청했어요.
He requested a special investigation.
'특검을' serves as the object of '통과시켰습니다' (passed), referring to the special counsel that got approved by the parliament.
국회가 특검을 통과시켰습니다.
The parliament passed the special counsel.
In this case, '특검을' is the object of the verb '요구하고 있어요' (are demanding), representing the proposal being demanded - the special investigation.