Funded and approved by the US Department of Treasury in 1943, this Disney featurette was to encourage every good American to do his "duty" and pay his taxes, which, at this time, were at an all time high. Those who do not wish to pay or don't pay it gladly are depicted as friends of Hitler and enemies of liberty and democracy.
Contrary to what has been stated on other posts of this film, it was never "banned" by anyone. Not only was it approved by the Treasury Secretary, it received an Academy Award nomination for "Best Documentary Feature." Even President Roosevelt himself had a hand in approving Donald Duck as the main character.