<P> Blue laws, also known as Sunday laws, are laws designed to restrict or ban some or all Sunday activities for religious reasons, particularly to promote the observance of a day of worship or rest . Blue laws may also restrict shopping or ban sale of certain items on specific days, most often on Sundays in the western world . Blue laws are enforced in parts of the United States and Canada as well as some European countries, particularly in Austria, Germany, Switzerland, and Norway, keeping most stores closed on Sundays . </P> <P> In the United States, the U.S. Supreme Court has held blue laws as constitutional numerous times, citing secular basis such as securing a day of rest for mail carriers, as well as protecting workers and families, in turn contributing to societal stability and guaranteeing the free exercise of religion . The origin of the blue laws also partially stems from religion, particularly the prohibition of Sabbath desecration in Christian Churches following the first - day Sabbatarian tradition . Both labour unions and trade associations have historically supported the legislation of blue laws . Blue laws are technically classed as "mala prohibita" or "wrong (as or because) prohibited" (as opposed to "mala in se" or "wrong or evil in itself"). Most blue laws have been repealed in the United States, although many states still ban the sale of alcoholic beverages or cars on Sundays . Bergen County, New Jersey is notable for their blue laws banning the sale of clothing, shoes, furniture, home supplies and appliances on Sundays kept through county - wide referendum . </P>

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