Memorial director Arseny Roginsky, quoted by the Russian news website Vesti, said it was "a complete check on everything concerned with our sources of funding".

BBC: Russian police raid rights group Memorial and other NGOs

In 1918, he began excavating the rock below the soil, fashioning everything from a bedroom (complete with a child's cradle), to a 30ft-tall, 60, 000lb coral telescope, all in honour of Agnes.

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However, a desire to make everything perfect, combined with a fear of letting go of complete control, can sometimes hold a startup back.

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