After leaving the army, with the rank of lieutenant colonel, he became active in Fascist circles, and joined the National Fascist Party (PNF). A mayor of Pisa in April 1923, Buffarini Guidi headed the local Party hierarchy from 1924 (his notoriety being increased by his career as a lawyer). He rose to become honorary Consul of the MVSN Blackshirts - the voluntary militia after the March on Rome.