book launch of ''Het virus der betrokkenheid. Het Internationaal Instituut voor Sociale Geschiedenis 1935-1989'' by author Huub Sanders obtained his PhD on the history of the Institute in the period 1935 to 1989 with his dissertation The virus of involvement. The International Institute of Social History 1935-1989, on April 10.This book is the story of concerned historians and activists who wanted to safeguard the heritage of and from the workers' movement and other emancipation movements, and make it available for research.