Like wolco, I'd kinda like a source for that claim, also. Tucows owns Hover, as well as being the back end for domain resellers through OpenSRS. To the best of my knowledge, Hover has never come up as "the preferred registrar of white supremacists"; while it's not at all unlikely that a reseller who uses OpenSRS's infrastructure has provided registration services to unpleasant characters, that would be a rather weaker claim against them.