Much of the Serbia’s northern province of Vojvodina has been blocked since May 30 by protesting farmers. They have reportedly deployed some 10,000 tractors and other large machinery on vital traffic points throughout the region, protesting the decision by the Ministry of Agriculture to cut their subsidies. The farmers initially planned to stage a protest in Belgrade, but following the intervention of the police, they responded by blocking the roads to the capital.
http://www.wsws.org/articles/2011/jun2011/vojv-j06.shtml
