Someone always on the lookout for the slightest sign of counter revolutionary thought or behavior in others, when they find it they send the tanks in, metaphorically speaking.

tankie A hardline Stalinist. A tankie is a member of a communist group or a "fellow traveller" (sympathiser) who believes fully in the political system of the Soviet Union and defends/defended the actions of the Soviet Union and other accredited states (China, Serbia, etc.) to the hilt, even in cases where other communists criticise their policies or actions. For instance, such a person favours overseas interventions by Soviet-style states, defends these regimes when they engage in human rights violations, and wishes to establish a similar system in other countries such as Britain and America.

The term is used to distinguish the rare individuals with these kinds of beliefs from communists more broadly (including Communist Party members), whose adherence to Soviet doctrine and attachment to existing "socialist" states is somewhat weaker.