The Ministry of the Interior and its governing area forms the largest ministry in Estonia that employs over 8000 employees in total. In its everyday work the Ministry develops and guides the field of internal security. The Ministry of the Interior (MOI) and the institutions in its governing area have a mission to assure the internal security of the state and to protect the public order, to guard and protect the state border and assure the border regime. The MOI and the institutions in its governing area also have a task to regulate the crisis management and rescue works as well as citizenship and migration. Officials of the internal security structures are taught in the Estonian Public Service Academy operating in the administrative area of the MOI.