Fish and Wildlife Conservation Act, 1997, S.O. 1997, c. 41
 

Obstruction of hunting, trapping or fishing

13 (1) A person shall not interfere with lawful hunting, trapping or fishing by,

(a) tampering with traps, nets, bait, firearms or any other thing used for hunting, trapping or fishing;

(b) placing himself or herself in a position, for the purpose of interfering, that hinders or prevents hunting, trapping or fishing; or

(c) engaging in an activity, for the purpose of interfering, that disturbs or is likely to disturb wildlife or fish.

Notice without authority

(2) A person shall not purport to give notice that entry to premises is prohibited for the purpose of hunting or fishing or that hunting or fishing is prohibited on premises unless the person has authority to give the notice.  1997, c. 41, s. 13.

All of the laws pertaining to fish and wildlife conservation are found here : https://www.ontario.ca/laws/statute/97f41

Please call your local police immediately if you become victim of unlawful harassment or threats.  

If you know the current hunting and fishing regulations then you will know that both are open right now.

Before accusing anyone you are strongly advised to call the MNRF hotline 1-877-847-7667 to check for current regulations and have them deal directly with the situation. 

Make sure to share this update with everyone you know. Hopefully people will understand and follow the law.