One solution to this is to develop, through force if necessary, a small group of people where cooperation is enforced, then expand that group.

Are you referring to the collectivization of agriculture in Russia? X-D

a rich, powerful Russian with a clean reputation

Ain't no such animal.

Are there anonymous online forums where Russians can discuss corruption?

Anonymity is on the speaker's end, not on the forums end. But you might be interested in Alexei Navalny who is politically active on the anti-corruption platform.