Final answer:
Giuseppe Mazzini was described as the most dangerous enemy of the social system. Mazzini was an Italian political activist and one of the key figures in the Italian unification movement.
Step-by-step explanation:
The quote 'the most dangerous enemy of our social system' was said about Giuseppe Mazzini. Mazzini was an Italian political activist and one of the key figures in the Italian unification movement known as the Risorgimento. He founded the organization 'Young Italy' and promoted a sense of shared Italian identity and nationalism. His ideas were considered radical at the time and he was eventually arrested and exiled for political subversion.