Ther eality of research suppression is much more mundane, and illustrated well in "The Trouble with Physics" by Smolin. Basically with the way the tenure and granting systems work the only way to get a degree and a job is to work on whatever the leading scientists decide is correct, which is most often their own ideas. At that point anyone who wants to try another approach will be unable to get funding, because all the "leading" scientists don't think it is worth pursuing, and you won't be able to get letters of recommendation and endorsement as a Post-Doc because you aren't doing things that make your tenured boss look good.