Any news articles or third-party reports to confirm that figure of 250M strikers? The only sources I've found on it so far are far-left political websites.
I hesitate to trust e.g. Fox News when reporting on the size of Trump's inauguration; likewise, I am skeptical to trust far-left websites reporting on the size of a far-left rally (as pics of hammer-and-sickle flags seem to indicate). An independent report on the size of these strikes would be helpful.