One way to misuse taxpayer funds is wasting it on first-class travel by government employees. Fortunately, the FY18 omnibus includes language to prohibit first-class travel paid for with public funds.
From page 85:
SEC. 710. None of the funds appropriated or otherwise made available by this Act may be used for first-class travel by the employees of agencies funded by this Act in contravention of sections 301–10.122 through 301–10.124 7 of title 41, Code of Federal Regulations.
TCS has consistently written about the misuse of public funds through travel, including when former Secretary of Health and Human Services Tom Price spent nearly $300,000 on private planes and travel.