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According to radiative models, radio galaxies may produce gamma-ray emission from the first stages of their evolution. However, very few such galaxies have been detected by the Fermi Large Area Telescope (LAT) so far.\n  Aims. NGC 3894 is a nearby (z = 0.0108) object that belongs to the class of compact symmetric objects (CSOs, i.e., the most compact and youngest radio galaxies), which is associated with a gamma-ray counterpart in the Fourth Fermi-LAT source catalog. Here we present a study of the source in the gamma-ray and radio bands aimed at investigating its high-energy emission a","authors_text":"2), 2: DiFA-BO, 3: GMU, (4) E. Torresi (5), 4: UNM, 5: INAF-OAS, 6: NRL), C. C. Cheung (6) (1: INAF-IRA, C. Stanghellini (1), F. D'Ammando (1), G. B. Taylor, G. Migliori (1, G. Principe (1), M. Giroletti (1), M. Orienti (1), T. J. 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