This beautiful and meanigful poem is derived from a speech of Reverend Niemoller. Here is the exact text of Reverend Martin Niemoller's address to the U.S. Congress, 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."

Several versions of this speech were made in poems, slightly different from each other. Hera are some of the most known versions:

In Germany they came first 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 trade unionists, and I didn't speak up because I wasn't a trade unionist. 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 no one was left to speak up.

First they came for the Jews, and I did not speak out because I was not a Jew. Then they came for the Communists, and I did not speak out because I was not a Communist. Then they came for the Homosexuals, and I did not speak out because I was not a Homosexual. Then they came for the Trade Unionists, and I did not speak out because I was not a Trade Unionist. Then they came for me, and there was no one left to speak for me.

They came for the Communists, and I didn't object - For I wasn't a Communist; They came for the Socialists, and I didn't object - For I wasn't a Socialist; They came for the labor leaders, and I didn't object - For I wasn't a labor leader; They came for the Jews, and I didn't object - For I wasn't a Jew; Then they came for me - And there was no one left to object.