Dealing with an Apikores
There is a Mitzva to speak against one who denies the Torah or any portion of the Torah.
If you don't know about this person yourself , but others tell you , you need to be cautious & to warn others to investigate.
If one refuses to listen to Beis Din without a valid excuse , we may also demean him.
Now may be a good time for a gem of Torah study.
www.GemsofTorah.com