It is:
"Trespass to Property Act" of Ontario
http://www.e-laws.gov.on.ca/html/sta..._90t21_ e.htm
See:
2. (1) Every person who is not acting under a right or authority conferred by law and who,
(b) does not leave the premises immediately after he or she is directed to do so by the occupier of the premises or a person authorized by the occupier,
is guilty of an offence and on conviction is liable to a fine of not more than $2,000. R.S.O. 1990, c. T.21, s. 2 (1).