At the 17th Party Congress in 1934, which coincided with the 10th anniversary of Lenin’s death, Stalin announced that the “anti-Leninist opposition” (which really meant those who oppposed him) was defeated. Bukharin, Alexei Rykov, Mikhail Tomsky, Karl Radek (a former Trotsky supporter) and others who had challenged Stalin in the leadership struggle, all admitted their “errors” to give the impression of unity at the top.