Nothing new. Germany had the "Baader Meinhoff" (aka RAF for Red Army Faction) group decades ago, which were truly left-wing terrorists.
To differing degrees, each country in Europe had similar movements.
Today Horst Mahler, a founding RAF member, is now a vocal Neo-Nazi and Holocaust denier.[53] In 2005, Mahler was sentenced to 6 years in prison for incitement to racial hatred against Jews.[54] He is on record as saying that his beliefs have not changed: Der Feind ist der Gleiche (The enemy is the same).[55]
In the US there was "The Weather Underground."
https://en.wikipedia.org/wiki/Red_Army_Faction