www.morganlewis.com/pubs/us-supreme-court-puts-the-brakes-on-irs-obstruction-prosecutions
www.cooley.com/news/insight/2018/2018-03-23-supreme-court-limits-criminal-tax-obstruction-statute
www.jonesday.com/us-supreme-court-government-went-too-far-in-tax-obstruction-prosecution-03-22-2018/