Here is a quote from Fee and Stuart’s book regarding the letter of James in the New Testament.
James is decidedly – as in the whole of Scripture – on the side of the poor. The rich are consistently censured and judged, not because of their wealth per se, but because it has caused them to live without taking God into account and thus to abuse the lowly ones for whom God cares.
Source: Gordon Fee and Douglas Stuart, How to read the Bible Book by Book (Grand Rapid: Zondervan, 2002), 399.