No it doesn't. As far as I know, the opposite thing happens: politically motivated research that doesn't deserve to be called scientific gets published over and over again. I'm specifically thinking about a few "scientific" articles sponsored by oil companies that happen to explain away global climate change, for instance. Or the many papers in which the Cato foundation, earnestly and with the best of intentions no doubt, tries to establish the inferiority of public healthcare. Or the Genesis Foundation defense of creationism.

There's no suppression. Just bullshit addition.