The following passage comes from a New York Times article:
Several days ago, additional actresses began sharing with The Times on-the-record stories of casting-couch abuses. Their accounts hint at the sweep of Mr. Weinstein’s alleged harassment, "targeting" women on the way to stardom, those who had barely acted and others in between. Fantasies that the public eagerly watched onscreen, the women recounted, sometimes masked the dark experiences of those performing in them.
I can't figure out the subject of "targeting".
What's the difference between "~ harassment, targeting ~" (<- with comma) and "~ harassment targeting ~" ? (<- without comma)
Is the sentence "targeting women ~~ in between" a participial construction?
Does the relative pronoun "which is" omit?
Thank you in advance.