Social_Democratic_Party_of_Germany
He's basically a Marxist.
That’s exactly what Maas is.
The SPD were boasting about being the original “Antifa” back when Trump designated the US Antifa as a terror group, too.
Last but not least, they share a name with the party that Lenin belonged to in Russia (the Social Democratic Labor Party of Russia), which he changed into the Communist Party of the Soviet Union when he seized power.