criminalize

    v. To impose a criminal penalty on or for; outlaw.
    v. To treat as a criminal.

I suppose the idea of "outlawing beliefs" might be more fitting. In any case, outlawing or criminalizing, isn't the result is the same?

Maybe a better response by Google: For any searches that would turn up these detestable sites, include some contrasting/opposing results. Balance it out - show how stupid the Neo-Nazi arguments really are using sites with well-reasoned counter-arguments. My concern is that flat out removal just allows the scoundrels to cast themselves as victims and sets some bad precedents.

[1] https://duckduckgo.com/?q=define+criminalize&t=ffab&ia=defin...