Local media said six activists were wanted on suspicion of secession or colluding with foreign forces, crimes that the new law punishes with up to life in prison.
"Its sheer size justifies the scrutiny," said Dania Rajendra of the activist group Athena, a coalition which is focused specifically on Amazon's corporate activity and treatment of workers.
Organisers of the march called for the German government to implement the 2015 Paris plan to shift the world economy from fossil fuels.
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