Under international law, all workers have a human right to organize and to bargain collectively.The Founding Fathers wrote any violation of rights from a power other than the people themselves was tyranny and slavery:
These rights are an essential foundation to the realization of other rights, and are enshrined in the Universal Declaration of Human Rights, the International Covenant on Civil and Political Rights (ICCPR), the International Covenant on Economic Social and Cultural Rights (ICESCR) and the Rights of All Migrant Workers and Members of their Families, as well as conventions adopted by the International Labour Organization (ILO).
As a state party to the ICCPR and a signatory to the ICESCR, the USA has an obligation to respect the human rights under these instruments and treaties.
As a member of the ILO, the USA also has a commitment, through the 1998 ILO Declaration on Fundamental Principles and Rights at Work, to respect, promote and realize the fundamental rights set out in the organization’s core conventions.
Moves to limit such rights in the USA are also at odds with commitments made under the North American Agreement on Labor Cooperation (NAALC) as well as numerous subsequent trade agreements negotiated and ratified over the last 15 years.
The preservation of a free government requires not merely that the metes and bounds which separate each department of power be universally maintained but more especially that neither of them be suffered to overleap the great barrier which defends the rights of the people. The rulers who are guilty of such an encroachment exceed the commission from which they derive their authority and are tyrants. The people who submit to it are governed by laws made neither by themselves nor by an authority derived from them and are slaves.--James Madison, A Memorial and Remonstrance Presented to the General Assembly of the State of Virginia at their Session in 1785 in Consequence of a Bill Brought into that Assembly for the Establishment of Religion (Massachusetts: Isaiah Thomas, 1786), pp. 4-5