The following version of Martin Niemoller's famous quotation or poem actually comes from the text of an Address he gave to the United States Congress in 1968 and which appears in the Congressional Record, October 14, 1968, page 31636.
"When Hitler attacked the Jews
I was not a Jew, therefore I was not concerned.
And when Hitler attacked the Catholics,
I was not a Catholic, and therefore, I was not concerned.
And when Hitler attacked the unions and the industrialists,
I was not a member of the unions and I was not concerned.
Then Hitler attacked me and the Protestant church --
and there was nobody left to be concerned."