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Summary of differences between federal and state regulations
Federal law generally does not regulate employment contracts between employers and employees with one exception: contracts that require the joining or refraining from joining of a labor union as a condition of employment. On the federal level, these contracts are governed by the National Labor Relations Act. States may have a corresponding provision and may also have additional provisions regarding employment contracts.
Idaho law has a provision similar to federal regarding union membership. It also has additional provisions.
Union membership
It is illegal for an employer to require either orally or in writing that an employee agree not to join or remain a member of a union as a condition of employment. §44-901
Similarly, an employer may not enter into any oral or written agreement with any labor union which violates the rights of employees with regard to union membership as a condition of employment. §44-2005
Breach of contract
A person has the right to collect wages, penalties and damages pursuant to an employment contract but any such legal action must begin within two years; with the exception that if any portion of the wages were paid, the action must commence within six months. §45-614
State
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Regulations
Union membership
Idaho Statutes Title 44, Chapter 9, §44-901
Idaho Statutes Title 44, Chapter 20, §44-2005
Breach of contract
Idaho Statutes Title 45, Chapter 6, §45-614