Definition from Wikipedia:

Stalinism refers to the ideology that Joseph Stalin conceived and implemented in the Soviet Union, and is generally considered a branch of Marxist–Leninist ideology but considered by some historians to be a significant deviation from this philosophy.[1] Stalinist policies in the Soviet Union included: rapid industrialization, Socialism in One Country, a centralized state, collectivization of agriculture, and subordination of interests of other communist parties to those of the Soviet party.[2] When used in its broadest sense, the term “Stalinist” refers to socialist states comparable to the Stalin-era Soviet Union (i.e., those characterized by a high degree of centralization, totalitarianism, the use of a secret police, propaganda, and especially brutal tactics of political coercion). According to Encyclopdia Britannica, “Stalinism is associated with a regime of terror and totalitarian rule.” [3]
The term came into prominence during the mid-1930s, when Lazar Kaganovich, a Soviet politician and associate of Stalin, reportedly declared, “Let’s replace Long Live Leninism with Long Live Stalinism!”[4] Stalin initially met this usage with hesitancy, dismissing it as excessively praiseful and contributing to a cult of personality.[4] In the Cold War-era United States, Stalinism took on a decidedly more negative meaning, akin to what the New York Times dubbed “red fascism.”[5]

How is criticizing xenophobia Stalinist? Maybe I’m just not smart enough to get it.