First, my interpretation of what is going on here:

The entire world was in the midst of a the Great Depression
in the 1930's, and it was particularly harsh in Germany, 
which had been heavily penalized for its part in World War I.

German charities had always been a significant factor in
its society, and under these difficult circumstances, they
expanded their efforts.

Then in 1933, the Nazis gained complete control of the 
country, and created a state-run charity system, absorbing
or replacing many of the private charities.

In the highly regimented Nazi state, contribution to charities
became obligatory - people who did not contribute were persecuted
socially and in some cases even prosecuted legally.
Collection campaigns were constant and very aggressive -
both door-to-door and in public places.

SO, a label like this was a necessity for those who "did their
duty" - gave enough to earn immunity from further solicitation.

Or at least that's what I think.

5/11/18 - I emailed Winterhilfswerk.com and asked about the 
second label, and they replied:
"These were a part of a donation packet so to speak. 
It served as sort of a plaque that one would put on 
their door or window to show that they already donated. 
It kept the constant door knocking at bay."

So that confirms what I had guessed.

BELOW, the text of the two labels, with translations.

================================

German text on 1936 label:

Sammel-Verbot für alle Angehörigen und Stellen der Partei, ihrer
Gliederungen und angeschlossenen Verbände, für den N. S. Deutschen
Frontkämpferbund, Deutschen Luftsportverband, Luftschutzbund, Arbeits-
dank, Reichsbund Deutscher Seegeltung, für den Reichssportführer, 
die ihm unterstellten Organisationen, das Organisationskomitee 
der XI. Olympiade und das Organisationenskomitee für die IV. 
Olympischen Winterspiele.

-------------------------------

Translation of text on 1936 label:

Collection ban for all members and agencies of the party, their
organizations and affiliated associations, for the National Socialist
German Front Fighter League, German air sports federation, air
protection federation, Labor Thanks, Reich federation German sea
regulation, for the Reich sport leader, the organizations subordinated
to it, the organizing committee of the XI. Olympiad and the Organizing
Committee for the IVth Winter Olympic Games.

===============================

German text on 1939 label:

Sammel-Verbot Das Winterhilfswerk, die Reichswinterhilfelotterien und
die Reichslotterien für Arbeitsbeschaftung fallen nicht unter dieses
Sammelverbot

-----------------------------------

Translation of text on 1939 label:

Collection ban -
The Winter Relief Organization, the Reich Winter Aid Lottery and 
the Reich lotteries for labor liability are not covered by this prohibition

==================================

References:
https://en.wikipedia.org/wiki/National_Socialist_People%27s_Welfare
https://en.wikipedia.org/wiki/Winterhilfswerk
http://winterhilfswerk.com/