By Moshik Temkin, Associate Professor of Public Policy, Harvard University. Bartolomeo Vanzetti (left), handcuffed to Nicola Sacco, 1923. Boston Public Library Ninety years ago, on Aug. 23, 1927, two Italian immigrants were executed. The deaths of Nicola Sacco and Bartolomeo Vanzetti in the Charlestown Prison in Massachusetts marked the end of a raucous seven-year legal and…