I watched a documentary called "The death of Yugoslavia". And in the beginning of the documentary Milosevic went to Kosovo the hear the people out. And politicians, nationalists and civilians claimed that the muslim albanians raped their women and killed people. The serbs claimed that the albanians wanted a ethnic pure Kosovo. Is there any evidence for these claims? Sorry for my English, not my first language.
Here is a previous answer of mine on the misfortunes of Albanians during the Balkan Wars. Not a comprehensive answer to your question but goes in some detail about persecution of Albanians in what would become Yugoslavia during the early 20th century, as well ass southern Albanians in Greece