The origin of the radio emission in active galaxies ranging from LINER
S to ultraluminous IRAS galaxies is considered under the scenario of a
violent nuclear or circumnuclear starburst. The radio luminosity is e
xplained as non-thermal radio emission generated in supernova remnants
(SNRs). Implications of this scenario in terms of the radio brightnes
s of SNRs, the supernovae rates, and their detectability are discussed
.