/r/ukpolitics is not a main sub, yet they operate on there as well. It is not very hard to have an alert any time anyone posts a topic with the word "Israel" in the title, coming to mass downvote anything remotely critical of their employer.
Of course on a main sub like /r/worldnews for example, the astroturfing there is even more noticeable and blatant.
You know what makes it even more obvious? How seemingly few Israeli or Jewish people on social media seem to be against the current massacre and/or the Netanyahu government. Of course there are many in the real world, but these dissenting voices are drowned by the massive pro-govt propaganda operation.