Many of the library databases include a mix of scholarly and popular literature. You can use limiters to locate news sources in Ram Search and other library databases. Check out the video tutorials on the Finding Scholarly Sources page of the guide
You can use the site: command in Google to search within a particular website or domain.
The search below will locate anything on the Vox website on the topic of slavery.
You can add any website or domain to the end of the site: search operator. You could try:
CARS is a checklist for evaluating websites