We began with notes covering the social classes that existed pre-Russian revolution (late 1800s and early 1900s). These come from a summation of Norman Lowe's Mastering Twentieth Century Russian History. You can find those notes here:
Introduction to Russian Social Classes
We followed that up with a reading covering some of Lenin's theoretical adjustments to Marxism. Most notable:
The need for a dictatorship of the proletariat
Conceding that working conditions for the proletariat had improved
Noting that the proletariat, by itself, would never initiate revolution and would only develop "trade union consciousness" (hence the need for the dictatorship)