Translation of "pihak" into English

Untuk kemudahan para juri, di pihak siapa kau beroperasi di sisi sungai ini?

For the benefit of the jury, on whose behalf were you operating on this side of the river?

Jika pihak yang lain tidak menawarkan informasi pribadi, lebih baik dibiarkan saja.

If the other party does not offer personal information, however, it is better to leave it alone.

Ya, sebagai pihak belakang layar.

Yes, in more ignorant quarters.