Because the redirects aren’t working for me, I’m going to assume others might have trouble with these links, so for those who need it the URL for the website to Writer Beware is:
www.sfwa.org/other-resources/for-authors/writer-beware/
As stated on here: “Writer Beware is sponsored by the Science Fiction and Fantasy Writers of America, with additional support from the Mystery Writers of America, the Horror Writers Association, and the American Society of Journalists and Authors.”
These are not publishers’ guilds, notice; you sometimes see scammers trying to defend themselves against Writer Beware exposes by claiming that they’re “small press” or “indie” and Big Publishing is somehow out to get them - but all of those guilds are run by and for writers, to help support them and represent them in the field. It is the closest writers have to having unions, and there’s no direct competition between them (you could literally be an in any of those guilds are the same time as each other, in addition to others, and I believe a number of authors are).
Writer Beware is a wonderful resource, and I highly recommend it. It’s both a good general guide to the scams people run/red flags to watch out for (such as giving up your copyright entirely as opposed to specific rights, or being charged to publish something or have it edited, when they’re trying to act like they’re a “normal” publisher), and a frequently-updated list of the latest specific known scammers, both in “fake agents” and fake/scammy publishers categories. (The company formerly known as Publish America is one of the most famous and egregious cases, but by far not the only one)
Additionally, for SF and fantasy writers, the SFWA’s own list of qualifying markets that one can be published in as a prerequisite to be able to get into their guild (remember, it IS a profession-based guild), is a great guide to normal markets for those genres that have standard contracts that aren’t abusive or scammy, and their guidelines include some of the industry-standard minimums for “per word” etc rates, so even if some new magazine market isn’t on their list, you can tell if it’s suspiciously far outside the usual per-word or whatnot standards. (It’s likely the guidelines for Mystery Writers of America etc also would be useful in that vein)
Even if you’re unpublished or don’t want to join their guild, they’re a wonderful group and resource, and I highly recommend their site and Writer Beware in particular!
The other sites mentioned above, such as “Preditors and Editors” should be still valid if you Google them, and are often rec’d by Writer Beware, but Writer Beware is the one I’m most familiar with. :)