John Marshall Harlan II,
Rudolph v. United States — Dissent
“ If a taxpayer who travels to a destination engages in both 'business and personal activities,' the traveling expenses are deductible only if the trip is 'related primarily' to the taxpayer's business; if 'primarily personal,' the traveling expenses are not deductible even though the taxpayer engages in some business there; yet expenses allocable to the taxpayer's trade or business there are deductible even though the travel expenses to and fro are not. ”
