The sentence element depends on the exact words highlighted in red and their position in the sentence. A highlighted phrase could function as a **subject, object, predicate, adjective, adverb, or another modifier** depending on how it is used. Please share the full sentence or an image showing the highlighted part, and I can identify the exact sentence element.

It is an an adverbial structure: an adverbial of manner, explaining HOW justice is meted out. I believe there is an error as it should read 'independently'.