Some sites to check out:
http://raganam.blogs.lv/ - “Buramie vārdi” in latvian

http://www.medintegra.lv/articles.php?lng=lv&pg=81 - Prāta, emociju un gara pašizaugsme - BURAMVĀRDI NESADEG

http://ankh.id.lv/viewtopic.php?p=143453&highlight;=&sid=b982df8883cb894e90297902727fdad1 - Tumshaas kultuuras portaals

Witchcraft consists of many aspects.  Some are healing - dziedinashana, magic words - buramie vardi, curse - laasts vai nolaadeet. 

Some of the designations for these people are
“zintnieks vai zintniece” - one who knows, usually a positive force person. 
“puushljotaajs vai puusljotaaja” - from the word for bladder, usually a healer
“ragana” - witch - usaually a negative force person
and of course chigaans vai chigaaniete” - gypsy, because they all seem to know some witchcraft.