In February 1934, the temporary Politburo of the CCP in Shanghai criticized the Manchuria provincial committee in the "Letter of February 22" for its "rightist mistake" to misinterpret the Letter of January 26. The letter pointed out the danger of "leader's collusion instead of people's united front" and requested to put forward the slogan to go to the stage of agrarian revolution. At the same time, CPC's delegation to the Comintern also took a series of measures in its organization to try to eliminate the influence of Letter of February 22. Cadres were sent back from the USSR to Manchuria to make clear instructions and future tasks of the united front.