My friend Mrs. Lev says she fell in love with Mr. Lev in the 1950's, while they were singing this song. Mr. Lev has been dead 25 years, but Mrs. Lev still remembers.
I found these lyrics on the Web, but I don't know if they're complete; and I haven't been able to find a German version. Actually, the version Mrs. Lev seeks is in English, German, and Spanish. Can anybody help? Can anyone explain the historical context of the song?
-Joe Offer-

The United Front Song (Einheitsfront)
Words by Bertolt Brecht. Set to music by Hanns Eisler

And just because he's human,
A man would like a little bite to eat.
He won't get full on a lot of bull.
That won't give him bread and meat.

CHORUS:
So left, two, three,
So left, two, three,
To the work that we must do.
March on in the workers united front
For you are a worker too.

And just because he's human,
He doesn't want a pistol to his head.
He wants no servants under him,
And no bosses overhead.

CHORUS:

And just because he's a worker,
The job is all his own;
The liberation of the working class
Is the job of the workers alone.

CHORUS:

Source: The Socialist Songbook.