Harry's War (1981)

Synopsis
Harry's War is a "feel good" movie--and you'd better feel good or else. Edward Herrmann plays an postman whose aunt (Geraldine Page) is victimized by the Internal Revenue Service. Uncle Sam has made an error on her return, insisting that the poor old pensioner must pay 190 grand in back taxes. Try as he might, Harry can't get anyone at the IRS to correct the booboo (the bureau is populated exclusively by movie stereotypes--one is amazed that Charles Lane and Franklin Pangborn don't show up). So he plots a delicious revenge on the government, on behalf of his aunt and all the other average joes of America. ~ Hal Erickson, All Movie Guide