Commissioned by MrAahz and built by fantasticoder
Reddit USL in Context adds an entry to your contect (right-click) menu labelled "Check Reddit USL". When right-clicking on a reddit username and selecting this you will be taken to the search page for reddit's Universal Scammer List and see the results (if any) for that user.
If you want an even quicker check - at the expense of slower page load times, then I suggest you look at the Reddit USL Check extension at https://chrome.google.com/webstore/detail/reddit-usl-check/mhkkkobdommkcfenngmfoffhhceofdaa