First they came...

First they came for the Communists,
  and I didn’t speak up,
    because I wasn’t a Communist.
Then they came for the Jews,
  and I didn’t speak up,
    because I wasn’t a Jew.
Then they came for the Catholics,
  and I didn’t speak up,
    because I was a Protestant.
Then they came for me,
  and by that time there was no one
    left to speak up for me.

by Rev. Martin Niemoller, 1945