Anjem Choudary led the Islamist group Islam4UK in Britain before it was proscribed under the UK's counter terrorism laws in 2010.
Choudary was in Helsinki last Thursday to speak at a secretive gathering held to mark the tenth anniversary of the jailing in Norway of Kurdish radical Islamist leader Mullah Krekar.
Last week, the Finnish Security Intelligence Service (Supo) confirmed to Yle that it was aware of the gathering. A Supo representative also told Yle at that time that it has long been known that there are increasing numbers of individuals in Finland with links to radicals.
According to the British newspaper The Sun, Choudary spoke to 60 Kurdish immigrants, telling them to “rise up” and predicted the Islamic flag would one day fly over the Finnish parliament building.
He told his listeners to be proud of being considered terrorists. Choudary also said that being called radicals means that they do not compromise.
A 2.5 hour video of the address was posted on YouTube.