>>2888898He literally did.
He killed of every single actually competent marxist during the purges leaving only incompetent corrupt dullards, and scheming opportunists behind in charge of the ussr after death.
His obsession with heavy indistry and military spending at the expense of consumer goods also extremely hurt the ussr and succesive leadership never changed course from it.
He also killed any remnants of workers democracy in the ussr making the proleteriat utterly powerless to do anything once the leaders of the ussr decided to sell out the entire country to capitalism.