Swiss immigrants to Russia
...that most Swiss immigrants to Russia, several thousand in all, left after the October Revolution in 1917?
...that most <b id="mwFLQ"><a href="./Swiss_emigration_to_Russia" id="mwFLU" rel="mw:WikiLink" title="Swiss emigration to Russia">Swiss immigrants to Russia</a></b>, several thousand in all, left  after the <a href="./October_Revolution" id="mwFLY" rel="mw:WikiLink" title="October Revolution">October Revolution</a> in 1917?