In June 2005, Russian prosecutors moved to ban the radical nationalist party, which had been involved in a series of anti-government protests, but the party continued its activities despite the ban.
"Repeated warnings [to the party] provide sufficient grounds to declare the organization extremist and to ban its activities," prosecutors said earlier.
The party, led by ultranationalist writer Eduard Limonov, targets its activities against current Kremlin's policies, and is a member of "The Other Russia" coalition of opposition parties.
In early March, the National Bolsheviks took part in an unsanctioned rally in St. Petersburg and hundreds of opposition supporters broke through police cordons and blocked traffic in the city center, protesting against a clampdown on civil liberties.
Prosecutors appear to be seeking to toughen an earlier ban imposed in 2005.
"The organization's activities will be suspended pending a court ruling", the Prosecutor General's Office said.
