Socialists in 1980: “We use walls, barbed wire, and men with guns to control our people. Deal with it.”
Socialists in 2000: “We’re ashamed of the Wall, but now we’re democratic socialists. Trust us!”
Socialists in 2020: “Just kidding. Bring back the Wall!”
Source: Jacobin, the Marxist/neo-Marxist true-believer magazine.
Related: Marx and Engels’ The Communist Manifesto, in the Philosophers, Explained series.