Stalin (ambiguous politically) allies with Kamenev and Zinoviev (Leftists) against Trotsky (very Leftist)
Stalin's former Leftist allies from the Troika against Trotsky (Zinoviev, Kamenev) turn AGAINST him with Trotsky after Socialism in One Country is announced.
Stalin's former Rightist allies against the United Opposition (Tomsky, Rykov, Bukharin) turn AGAINST him because he swings left, abandoning Lenin's NEP and starting collectivisation.
Russo-Polish borders are settled.
a very liberal constitution that gave many rights, universal suffrage, etc.