Russes blancs
As with first and second wave, if the White émigré left Russia to any country, they were still considered first or second wave, even if they ended up moving to another country, including the US at a later time. There was no 'strict' year boundaries, but a guideline to have a better understanding of the time period. Thus 1917-1922 is a guideline. There are Russians who are considered second wave even if they arrived after 1922 up to 1948.