Robert H. Jackson, Callen v. Pennsylvania Railroad Company…
“ One who attacks a settlement must bear the burden of showing that the contract he has made is tainted with invalidity, either by fraud practiced upon him or by a mutual mistake under which both parties acted.The plaintiff has also contended that this release violates § 5 of the Federal Employers' Liability Act which provides that any contract to enable any common carrier to 'exempt itself from any liability created by this chapter, shall to that extent be void.' 35 Stat. ”
