I looked at the above link, and it's actually a fairly heavily referenced book review written by Richard Lynn, a professor of psychology. The subject matter of the book is heavily within Lynn's area of expertise and stays focused on the substance. The guy is both a prominent academic in the psychology of intelligence, and willing to affiliate with publications, organizations, and events associated with nasty and silly ethnocentrism. Some possible heuristics we could apply here:
1) Read everything Lynn writes, both in academic journals and books, and in articles written for non-academic political publications, since he's an academic with relevant expertise.
2) Read everything Lynn writes, both in academic journals and books, and in articles written for non-academic political publications, but exclude things written for political publications where strongly disapproved writings appear (even if the Lynn article itself is unobjectionable).
3) Only read his academic articles and books, and not popularizations or other writings.
4) Don't read anything by this guy, either because his associations indicate his academic work is bad, or accepting any lost opportunities to learn as a legitimate cost of supporting norms of tolerance among majorities.
5) Don't read anything by people with Lynn's associations, but also extend one more level to exclude people who have associated with them, e.g. Arthur Jensen. Only read people who have political associations for which their research is inconvenient.
What are you thinking of?
Remember that too far down the list, one would also wind up excluding many of the arguments in the scientific literature against hereditarianism, at least on race, as the well-known anti-hereditarian authors often have strong Marxist, socialist and related commitments, e.g. Stephen J. Gould. In some cases, such as Gould's, that would be justified: Gould was caught in numerous errors and falsehoods skewed in the direction of his politics. But this would still slice away vast swathes of the relevant literature, if not the raw data.
Summary: Current social psychology research is probably on average compromised by political bias leftward. Conservative researchers are likely discriminated against in at least this field. More importantly papers and research that does not fit a liberal perspective faces greater barriers and burdens.
An article in the online publication inside higher ed on a survey on anti-conservative bias among social psychologists.
The link above is worth following. The problems that arise remind me of the situation with academic and our own ethics in light of this paper.
I can't help but think that self-assessments are probably too generous. For predictive power of how an individual behaves when the behaviour in question is undesirable, I'm more likely to take their estimate of how "colleagues" behave than their estimate of how they personally do.
This shouldn't be surprising to hear since to quote CharlieSheen: "we even have LW posters who have in academia personally experienced discrimination and harassment because of their right wing politics."
While I can see Lammers' point that this as disturbing from a fairness perspective to people grinding their way through academia and should serve as warning for right wing LessWrong readers working through the system, I find the issue of how this our heavy reliance on academia for our map of reality might lead to us inheriting such distortions of the map of reality much more concerning. Overall in light of this if a widely accepted conclusion from social psychology favours a "right wing" perspective it is more likely to be correct than if no such biases against such perspectives existed. Conclusions that favour "left wing" perspective are also somewhat less likely to be true than if no such biases existed. We should update accordingly.
I also think there are reasons to think we may have similar problems on this site.