This section is from the book "Constitutional Law In The United States", by Emlin McClain. Also available from Amazon: Constitutional Law in the United States.
It may be true that the prohibition in the federal constitution as to abridgment of "the right of the people peaceably to assemble and to petition the government for a redress of grievances" (Amend. I), and similar prohibitions in the state constitutions, primarily had reference to assemblies for political purposes. Nevertheless, the right guaranteed is not to be regarded as a mere political privilege, but one just as fundamental as that of freedom of speech and the press, or freedom of contracting, or any other phase of liberty recognized by our constitutional system. Assemblies may be held, not only for political purposes, but also for religious, social, and business purposes; and regardless of the object, if it be lawful, and the method, if it be timely and orderly, the exercise of the right is to be recognized and protected. The government may properly, in the preservation of peace and order, suppress or disperse assemblies made for an unlawful purpose or cause, or which by reason of the time, place, or manner, are illegal, dangerous, or turbulent. No doubt the right to assemble for political purposes in connection with the selection of presidential electors or congressmen, or for the purpose of petitioning the federal government, is a privilege of United States citizenship, but the general right to assemble for lawful purposes, and in proper and orderly places and manner, is a civil right, to be protected like other civil rights by the states. It is not granted by constitutions, but by them is recognized and protected.
 
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