Well their military and government was chock full of it, which is why Finland was so eager to help germany:https://www.abc.net.au/news/2019-02-11/report-finds-finnish-soldiers-were-complicit-in-wwii-atrocities/10798222

German influence in the government and many other aspect was apparent in the buildup of the Lapua movement in the early 30s. It was crushed, but the fact a fascist revolution even could happen is indicative of its popularity.

I hate to use wikipedia, but this article I had in my drives has been checked to be found pretty good: https://en.wikipedia.org/wiki/Far-right_politics_in_Finland

It specifically highlights the existence of heightened fascist power from 1929 on to the early 40s. That is why it so eagerly sided with Nazis, took part in miniature holocausts, and participated in an idea of expansionism into soviet territory. It wanted land it lost in 1940 due to losing the winter war, even though the Soviets signed a large truce and guaranteed their independence as a country moving forward. Fascism heightens imperialist ambitions of capitalism, causing them to side with the barbaric nazis as they tore through the USSR's countryside in Barbarossa.

The Soviets though, again, started kicking their ass back into their lands, and killing their fascist elements. I said Finland had adapted Fascism, not become it, so they just needed to be entirely threatened to be shown the error of such ways, and then turned against fascism.

Sadly since the fall of the soviets they have slowly started up "Finland First" fascist movements. They've regressed on taking care of their school system, which is at risk of quickly falling in quality.