White power webrings use ideological purity tests to regulate membership.

Evidence

The existence of the United Skins Webring is a good example of this kind of networking. The Webring enables skinhead sites to be entered as part of a connected circle of sites. However, not all skinheads are invited. “Baldies, commies, queers and trads [i.e. traditional skinheads] that can’t admit they like Skrewdriver need not apply,” they warn. — David Theo Goldberg, John Solomos, A Companion to Racial and Ethnic Studies, 2555