Really, it ought to be called a "March for the Liberation of Russian Citizens Taken Hostage by the Occupiers".

But it is called the "March for Your Freedom and Ours":

The hearing in the "Bolotnaya case" has begun in "court". The first 12 people are sitting in the "dock" as "defendants," even though we all know their only "guilt" is that the Kremlin’s Chief Crook did not want anyone openly protesting election fraud. Polls show that among Muscovites, 81% support the intimidation version and 19% the version that this is about punishing the guilty. Across Russia, 57% of citizens understand that this is not a "trial" but intimidation. Any one of us could have been in their place. They are imprisoned for all of us. In support of these people, a march will take place in Moscow on June 12. The route map looks like this:

On June 12 at 12:00, for the 12 prisoners.

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