This is a pretty good idea, might be willing to help some.
The tricky bit would probably be scraping (beautifulsoup etc.)
Many socialist news sites are not going to have an RSS feed.
You would probably also need volunteers to do tagging.
As an alternative you could have something like the main view of
https://lobste.rsBut with a bot automatically collecting certain news articles, by scraping etc.
Once again with volunteers tagging them, or optionally even submitting stories.