These galleries are either the work of amateurs, documenting the situation in a specific region at a specific time (for example in Bosnia in 2001, in Kosovo in 2006), some archive material, such as the work from Alexei Gessler on Rroma in Russia, or are the work of professional photographers, such as Yves Leresche; Josef Koudelka, Rolf Bauerdick, Joakim Eskildsen, etc…
The latter ones are provided here as external links.
EN 
DE 
FR