The far-right president-elect was swept to victory Sunday on a wave of anti-establishment outrage fueled in part by Moro's investigation into the large-scale looting of state oil company Petrobras
Markets reacted positively to the victory by the business-world favorite, who will take office on January 1.
The town, whose population had been dwindling for decades, made headlines around the world by welcoming migrants in an attempt to revitalise itself.
The German nationals, aged 20 to 31, were taken into custody for allegedly forming a group called "Revolution Chemnitz" with the aim of subverting the democratic state.
The increasingly open displays of anti-migrant sentiment reflect Germany's ongoing effort to come to terms with an influx of more than 1 million refugees and migrants seeking jobs since 2015.
In Chemnitz, like in many other towns and cities, there is a simmering anger over crimes committed by migrants which have been given a high profile in the media.
French far-right leader Marine Le Pen proposed changing the name of her party to the National Union on Sunday as part of efforts to improve its image.
Catalonia's separatist challenge heats up, far-right groups are increasingly taking to the streets in their quest for Spanish unity.