The Wall of Grief, or Wall of Sorrow, as it's also known, can be found at a busy intersection on the Garden Ring Road in Moscow.

It's a memorial to the estimated 750,000 victims of political persecution under Joseph Stalin.

The bronze memorial depicts faceless, human figures, and it was dedicated by none other than Russian President Vladimir Putin in 2017.

This past weekend, the Wall of Grief was the site of one of many makeshift memorials to Russian opposition leader Alexei Navalny, who died at a remote

penal colony late last week. And while Putin may have urged Russians not to forget the tragedy of oppression

when he dedicated the wall of grief, hundreds of people have been detained

across Russia since Navalny's death was announced.

Navalny's death

was announced.

Navalny's death follows a long established pattern in Putin's Russia.

Russian prison officials say Navalny died of quote, sudden death syndrome,

a petition demanding the release of his body, has drawn thousands of signatures.

So far, Navalny's aides and his mother have been blocked from seeing it.

What is clear is that Navalny seems to have suffered the same fate as many of the Russian

president's other rivals.

Guardian correspondent, Luke Harding, covered Russia for years.

He's also the author of a very expensive poison which details the

poisoning and death of Putin critic Alexander Lifinenko. I think you can say

with confidence pretty much all of Vladimir Putin's opponents, domestic political opponents are either in exile or they're dead.

And that's the way that Putin likes it. I mean you don't have to be Sherlock Holmes to see who might be responsible.

Consider this, the charismatic Navalny was the face of resistance to Vladimir Putin.

Will his death have a chilling effect on those who oppose the Russian

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