Question: What is the name of the act which changed the collective noun of the group Byron Chief-Moon identifies with?

Context paragraphs:
Noir Belge: Noir Belge (Belgian Black) is collective noun referring to black limestone found on several sites in Belgium.  Some trade names refer more specifically to the quarry were the material was found, for example "Noir de Mazy" or "Noir de Golzinne".  Some "Noir belge marble" deposit belongs to a fine-grained calcareous sedimentary formation dated Frasnian era (Upper Devonian – around 360 millions years ago) and located on the northern border of Namur sedimentary basin.  A few black limestones located in the lower Carboniferous (near the city of Dinant)

Application software: An application program (app or application for short) is a computer program designed to perform a group of coordinated functions, tasks, or activities for the benefit of the user.  Examples of an application include a word processor, a spreadsheet, an accounting application, a web browser, a media player, an aeronautical flight simulator, a console game or a photo editor.  The collective noun application software refers to all applications collectively.  This contrasts with system software, which is mainly involved with running the computer.

Sumur (Levant): Sumur (Biblical Hebrew: [collective noun denoting the city inhabitants]; Egyptian: "Smr"; Akkadian: "Sumuru"; Assyrian: "Simirra") was a Phoenician city in what is now Syria.  Zemar was a major trade center.  The city has also been referred to in English publications as Simyra, Ṣimirra, Ṣumra, Sumura Ṣimura, Zemar, and Zimyra.

Indigenous peoples in Canada: Indigenous peoples in Canada, also known as indigenous Canadians or aboriginal Canadians, are the indigenous peoples within the boundaries of present-day Canada.  They comprise the First Nations, Inuit and Métis.  Although "Indian" is a term still commonly used in legal documents, the descriptors "Indian" and "Eskimo" have somewhat fallen into disuse in Canada and some consider them to be pejorative.  Similarly, "Aboriginal" as a collective noun is a specific term of art used in some legal documents, including the Constitution Act 1982, though in some circles that word is also falling into disfavour.

Senegambia (Dutch West India Company): Senegambia, also known in Dutch as "Bovenkust" ("Upper Coast"), was the collective noun for the fortifications and trading posts owned by the Dutch West India Company (DWIC) in the region now known as Senegal.  The main purpose of these trading posts was to obtain slaves in order to ship them to the Americas.  The government of the territory was based on Gorée.  In 1677, the Dutch lost this island to France.  The next year, the French also conquered all DWIC trading posts on the Senegalese coast as well as the island of Arguin.

Brigade (pejorative): The word brigade, originally used to describe a military unit, can also be used as a pejorative collective noun to describe an informal group of like-minded individuals with views with which the speaker disagrees.  It is used as a mild term of disapproval or contempt, or in an attempt to belittle and ridicule the subject.

Rouge Belge: "Rouge Belge" is a collective noun designating diverse Devonian red limestone varieties found in Wallonia (Belgium).

Byron Chief-Moon: Byron Chief-Moon is an Aboriginal Canadian actor, choreographer, dancer, playwright, and founder of the Coyote Arts Percussive Performance Association, a dance theatre company.

Collective singular: The collective singular is a grammatical term for using the singular verb form with a collective noun.  In other words, groups are referred to as one entity rather than as a collection of individuals.  This rule is standard in the United States, but uncommon in the UK.

Collective noun: In linguistics, a collective noun is a word that refers to a collection of things taken as a whole.  Most collective nouns in everyday speech are mundane and do not identify just one specific kind, such as the word "group", which may apply to "people" in the phrase "a group of people" but may also correctly refer to "dogs", in the phrase "a group of dogs".  Other collective nouns are specific to one kind, especially terms of venery, which are words for specific groups of animals.  For example, "pride" as a term of venery always refers to lions, never to dogs or cows.

Supporting paragraphs: Byron Chief-Moon Indigenous peoples in Canada
Answer: Constitution Act 1982