The older male cat is bullying the new younger male cat so he has been submissive.

Who is "he" in this prior sentence?
the new younger male cat
The United States sanctions Iran since they recently were caught in plotting an assassination.

Who is "they" in this prior sentence?
Iran
The bartenders threw ice at the Jersey Shore cast because they were not wanted in the club.

Who is "they" in this prior sentence?
the Jersey Shore cast