Bylaw is a related term of mandate.
As a noun bylaw
is a local custom or law of a settlement or district.
As a verb mandate is
* byrlaw (obsolete)
* by-law, bye-law, byelaw
A local custom or law of a settlement or district.
A rule made by a local authority to regulate its own affairs.
A law or rule governing the internal affairs of an organization (e.g., corporation or business).
* bylaw officer
An official or authoritative command; an order or injunction; a commission; a judicial precept.
to make mandatory