Nippon Broadcasting System Inc. employees objected Thursday to Livedoor Co.'s attempt to take control of the firm.
The employees said the takeover would damage the radio company's relationship with its listeners and sponsors.
"We Nippon Broadcasting employees support the present management's intention of staying in the Fujisankei group and are opposed to Livedoor's joining management," workers of the Tokyo-based AM radio broadcaster said in a statement.
Nippon Broadcasting belongs to the Fujisankei Communications Group, a media conglomerate with Fuji Television Network Inc. serving as a core company.
The employees said remarks by Livedoor President Takafumi Horie show "no devotion to listeners."
They said: "Rather than joining the management of a media organization, he appears to be trying to manipulate (Nippon Broadcasting's) capital structure. If we come under Livedoor, we can expect that our fellow organizations in the Fujisankei group, sponsors and business clients will consider reviewing their ties with us."