Expulsion of Greeks from Istanbul
The Turkish government, then led by the Republican People's Party (CHP), enacted a series of measures in 1964–1965 that resulted in a dramatic decrease in the number of Greeks in Istanbul. It marked the culmination of earlier discriminatory policies and episodes of anti-Greek violence, including the "wealth tax" of 1942 and the anti-Greek pogrom of September 1955.
Source: Wikipedia — Expulsion of Greeks from Istanbul (CC BY-SA 4.0)