"Glasnost" resulted in greater freedom of speech and the press becoming far less controlled. Thousands of political prisoners and many dissidents were also released. Soviet social science became free to explore and publish on many subjects that had previously been off limits, including conducting public opinion polls. The All−Union Center for Public Opinion Research (VCIOM)—the most prominent of several polling organizations that were started then— was opened. State archives became more accessible, and some social statistics that had been kept secret became open for research and publication on sensitive subjects such as income disparities, crime, suicide, abortion, and infant mortality. The first center for gender studies was opened within a newly formed Institute for the Socio−Economic Study of Human Population.