Picketing is generally allowed in the United States when employees wish to educate the public and other employees about circumstances within a business that employs more than one person. This is legal as long as the demonstration is peaceful.
Picketing for Love - 1938 was released on: USA: 28 May 1938
picketing
The civil servants in Wisconsin are picketing the state house, with signs and chanting, to demonstrate their passion for their pension payments.
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Picketing/boycotting.
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Picketing outside government buildings.
picketing
It is known as "picketing"
if it is done with a permit
On public property, yes.