The term originated in Soviet Russia as a shortened name for the Department for Agitation and Propaganda (отдел агитации и пропаганды, otdel agitatsii i propagandy), which was part of the central and regional committees of the Communist Party of the Soviet Union. The department was later renamed Ideological Department. Typically Russian agitprop explained the policies of the Communist Party and persuaded the general public to share its values and goals. In other contexts, propaganda could mean dissemination of any kind of beneficial knowledge, e.g., of new methods in agriculture. After the October Revolution of 1917, an agitprop train toured the country, with artists and actors performing simple plays and broadcasting propaganda.[3] It had a printing press on board the train to allow posters to be reproduced and thrown out of the windows if it passed through villages.[4]
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“The pioneer Russian marxist Plekhanov pointed out an important consequence of this distinction. “A propagandist presents many ideas to one or a few persons; an agitator presents only one or a few ideas, but presents them to a mass of people”. Like all such generalisations this one should not be taken too literally. Propaganda can, in favourable circumstances, reach thousands and tens of thousands. And the ‘mass of people’ reached by agitation is a highly variable quantity. Nevertheless, the general point is sound.”
https://www.marxists.org/archive/hallas/works/1984/09/agitprop.htm