Although he was a serious poet who won prizes for his verse, Conquest was also a gifted practitioner of the limerick. As usual with this form, the results are mostly not suitable for a family website, but Roger Kimball's tribute includes this one, which neatly sums up the U.S.S.R. from 1917 to 1953.
There was a great Marxist called Lenin
Who did two or three million men in
That’s a lot to have done in
But where he did one in,
That grand Marxist Stalin did ten in.