On April 15, 1920, two men were robbed and killed while transporting the Slater-Morrill Shoe Company's payroll. The police found several different types of bullets and shells at the scene.
Two days after the robbery, police found the robbers' Buick, several 12-gauge shotgun shells were found on the ground nearby.
Suspecting anarchist involvement in the crime, police investigations started with Italian anarchist Ferruccio Coacci. This investigation eventually led to the arrest of Nicola Sacco and Bartolomeo Vanzetti.
Sacco and Vanzetti were both charged for the murders and robbery of the Slater-Morrill Shoe Company, and both were convicted and sentenced to prison time. A year later, they were tried for another crime, found guilty, and sentenced to death.
On August 23, 1927 Sacco and Vanzetti were executed with the electric chair, despite a group of 20,000 protesters who supported Sacco and Vanzetti's claim of innocence.
The Sacco and Vanzetti case was significant because it established important legal principles. It showed the corruptness of the US legal system and how unfair it was towards immigrants and the sheer level of racial discrimination in the courts. Millions of people around the world showed their support for Sacco and Vanzetti and believed they were innocent.