Open Access journals with article processing charges (APCs) are an attempt to change the way scholarly journals work, allowing authors or their institutions to pay once the article had been peer reviewed and accepted. The move away from subscriptions would allow anyone in the world to freely read the scholarship presented.
This business model, linked with the ability to create professional-looking web pages cheaply, gave scammers an opportunity. They create a fake journal website, solicit articles from researchers via email, accept those articles immediately without any peer review, collect the APC, and post the article. Fake conferences also follow this model.
In 2018 the International Consortium of Investigative Journalists started publishing articles resulting from their investigation of predatory journals. Several of those articles are linked below.
Finding Reliable OA Journals and Books
Since identifying a predatory journal is a process and involves a lot of subjective considerations, there isn't one list of bad actors. You should use one or more of the sites below to help you identify predatory journals.