The Tiananmen Square Massacre was a response to?

The Tiananmen Square Massacre was a military attack on unarmed civilians protesting against economical changes introduced by Deng Xiaoping (focus on material prosperity instead of ideological purity). The government had hidden many facts about the bloo dy riot, so today there are many unexplained aspects - like the amount of victims, ranging from a few hundreds to a few thousands. It took place on 3-4 June of 1989.