790 is a leading Supreme Court of Canada decision on the constitutional protection of minority language rights.

Allan Singer was a Montreal printer who mostly served anglophone clientele.

The issues before the Supreme Court were: In a unanimous decision, the Supreme Court held that the Language Charter concerned a valid provincial matter but it violated Singer's freedom of expression under section 2(b) of the Canadian Charter as it prohibited the use of English.

The Court rejected Singer's argument that the law restricted mobility as protected under the Charter.

Though there was a prohibition and a penalty, the Act as a whole it constituted a regulatory scheme directed as the linguistic mode of certain commercial activities, and did not resemble any traditional criminal matters based on morality or public order.