This section is from the book "The Law Of Contracts", by Samuel Williston. Also available from Amazon: Treatise on the Law of Contracts.
Contracts with alien enemies forbidden............................... 1747
Contracts with aliens suspended or avoided by declaration of war........ 1748
Agreements involving violation of foreign laws......................... 1749
Contracts tending to promote illegal acts.............................. 1750
Contracts to indemnify for an illegal act.............................. 1751
Contracts collaterally connected with unlawful intent or act............. 1752
Test of whether agreement is collateral. Parol evidence................. 1753
Knowledge of another's unlawful purpose.............................. 1754
Promotion of another's unlawful purpose.............................. 1755
The distinction often difficult........................................ 1756
Executory promise to furnish goods intended for unlawful purpose imposes no liability...................................................... 1757
Effect of performance, illegal when contract was made, becoming legal........ 1758
Effect of performance, legal when contract was made, becoming illegal.... 1750
Change of purpose regarding performance not unlawful in itself............ 1760
Illegal performance of legal contract.................................. 1761
Executory and executed illegal contracts.............................. 1762
Contracts and sales prohibited by statute.............................. 1763
Mala prohibita and mala in se........................................ 1764
Illustrations of prohibitory statutes................................... 1765
Further illustrations of prohibitory statutes............................ 1766
Slight violations of statutory prohibitions............................. 1767
Statutes purely for revenue.......................................... 1768
Revenue statutes may invalidate contracts............................ 1769
Statutes for the protection of the parties.............................. 1770
Contracts of corporations doing business illegally....................... 1771
Statutes expressly prohibiting recovery................................ 1772
Corporation illegally doing business is liable on its contracts and may set them up in defence............................................... 1773
Wrongful addition of "& Company" to name.......................... 1774
State power to control interstate commerce is limited................... 1775
Unconstitutional state prohibitions................................... 1776
Police power of the States.......................................... 1777
Illustrations of protected interstate commerce.......................... 1778
Where some things promised are illegal, and some legal, the latter may be enforced if consideration is legal...................................... 1779
Illegal consideration................................................ 1780
Sale of several things at separate prices............................... 1781
Partly illegal bilateral contracts...................................... 1782
Illegal and insufficient consideration distinguished...................... 1783
Notes and accounts stated........................................... 1784
Recovery of profits of an illegal transaction from a partner or agent........ 1785
Criticism of suggested distinctions between partner and agent............ 1786
Rescission of executed illegal contracts................................ 1787
Rescission allowed when illegal agreement unexecuted................... 1788
Parties not in pari delicto........................................... 1789
Where one party is a fiduciary....................................... 1790
Where one party was induced by fraud to enter into the illegal contract... 1791
Conflict of laws.................................................... 1792
 
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