Check out this analysis through case studies of its origins, dissemination and impact upon people.
This study looks at the following:
-How the hate speech was first generated (journalistic malpractice, stigmatising statements by authorities, etc.).
-How the hate speech was then disseminated and the type of language used.
-The real-life impact in terms of human rights on the Roma people who are the subjects of such hate speech in the various locations where it occurs (feelings of rejection, the creation of other kinds of attitudes, discrimination, hate, etc).