I feel a strong case has been made that PLANS presents a distorted view, is not a published source, has a strong agenda (and may qualify as a hate group) and does not meet various other guidelines for sources and links. I can see including them in the Outside Views section, which allows people to see the range of opinion that's out there and this group as one extreme. I do not feel that including them as a sole "critical views" source is appropriate, however. Add more critical links (and preferably published material!) if you feel that there's so much justified criticism out there!!! Otherwise there's at least the appearance (arguably reflecting the reality) of this group being extremists supported by no evidence.