https://en.wikipedia.org/wiki/First_they_came_...

First they came for the communists, and I did not speak out—
     Because I was not a communist.

Then they came for the trade unionists, and I did not speak out—
     Because I was not a trade unionist.

Then they came for the Jews, and I did not speak out—
     Because I was not a Jew.

Then they came for me—and there was no one left to speak for me.