 Complete the following phrase:  Unofficial figures are much larger. It is estimated that between 1948 and 1989 close to 1 million people left communist-ruled Czechoslovakia. The largest exoduses occurred following the communist takeover in February 1948 and following the Warsaw Pact invasion of Czechoslovakia in 1968, with around 200,000 people leaving in each wave. A very similar 200,000-strong refugee wave left Hungary in 1956 after their 