Jamieson, Fausset and Brown on Job 9:24

24. Referring to righteous "judges," in antithesis to "the wicked" in the parallel first clause, whereas the wicked oppressor often has the earth given into his hand, the righteous judges are led to execution--culprits had their faces covered preparatory to execution (Es 7:8). Thus the contrast of the wicked and righteous here answers to that in Job 9:23.

if not, where and who?--If God be not the cause of these anomalies, where is the cause to be found, and who is he?