The movement said in a press release ethnic cleaning was carried out during Storm because many civilians were killed and more than 250,000 people were forced out of their homes.
The movement said that refusing to accept responsibility for all the crimes committed in the wars in the former Yugoslavia prevented the region from being included in European processes.
Belgrade's Centre for Human Rights said that after Operation Storm Croatia became an almost ethnically clean state in which only a small percentage of Serbs now live.
"The ethnic situation was changed completely in only four days in the parts of Croatia where Serbs lived in significant numbers before the war. During and after the operation many crimes were committed against Serb civilians," this nongovernmental organisation said in a press release.
It called on the Croatian judiciary to launch proceedings against those suspected of having committed crimes during Storm, "including against the military commanders who ordered or tolerated the crimes".
The centre said this was the only way to assure refugees that they could return to prewar homes if they wanted to, as well as the only way for Serbia and Croatia, and especially their citizens, to have a future in Europe.