Russia says it has opened a legal case against the vote-monitoring group Golos.
The Justice Ministry accused Golos and its executive director of being engaged in political activity in Russia and receiving foreign funding but failing to declare itself as a "foreign agent."
Golos denied that it received any foreign funding in the period under consideration.
The move comes after a recent wave of much-criticized state inspections of Russia's nongovernmental organizations.
Under a law passed last year, NGOs operating in Russia are required to officially register as “foreign agents” if they receive financing from abroad.
Failure to do so carries a potential fine of up to 500,000 rubles ($16,000) for the organization and 300,000 rubles (about $9,500) for its executive director.
Based on reporting by AFP and AP