The Internal Security Board of Catalonia () was a body created in September 1936 as a result of the pact reached by the republican political forces on the one hand and the CNT-FAI on the other. The Generalitat de Catalunya and all democratic parties reached this agreement with the CNT-FAI to try to pacify public safety, severely altered since the July 1936 military coup, under the auspices of the anarcho-syndicalist organization. This pact involved the dissolution of the Central Committee of Antifascist Militias, replaced in part by the Junta. The militant anarchist Aurelio Fernández Sánchez was appointed general secretary, while in one way or another Rafael Vidiella (PSOE) and Joaquim Olaso i Piera (PSUC) were also present, as well as Tomàs Fàbregas Valls (ACR).