Satakunta District Court has found Tuukka Kuru guilty on a charge of ethnic agitation.
Kuru is the leader of the openly racist and fascist Blue-Black Movement.
The charges arose from a tweet Kuru posted in 2020, in which he commented on male circumcision by stating that "criminalisation of Judaism actually sounds quite good".
The court fined Kuru a total of 1,280 euros, and also ordered him to delete the offending tweet.
Parliamentary candidate and party leader
Kuru stood as a candidate for the Blue-Black Movement in April's parliamentary election, running in the Uusiamaa constituency. He received a total of just 323 votes and was not elected to parliament.
The movement itself garnered just 0.1 percent of the total nationwide vote, with 2,307 people voting for the party in April's election.
The Blue-and-Black Movement was formed in 2021 by individuals expelled from the Finns Party and its youth wing over their ethno-nationalist views. It was accepted into the official party registry last summer after revising some aspects of its party programme, including the idea of establishing an ethnic registry.
According to its manifesto, the party describes itself as a "radical, traditionalist and pro-Finnish party" and aims to create "an ethnically homogeneous Finland, free of ethnic conflicts of interest between different minority ethnic groups and the native population."