The police have notified us that our tenants are under investigation for fraud. Can we evict them on this basis? What rights do we have as the landlords to ensure our rent payments from these tenants will not be affected?

The Landlord and Tenant Board will not normally evict a tenant for an illegal act unless the tenant or another occupant of the rental unit has committed an illegal act or is carrying on a an illegal business at the rental unit, and/or the act is serious enough that it has the potential to affect the character of the premises or to disturb the reasonable enjoyment of the landlord or other tenants. The Board’s Guideline #9 – EVICTION FOR AN ILLEGAL ACT OR BUSINESS https://tribunalsontario.ca/documents/ltb/Interpretation%20Guidelines/09%20-%20Eviction%20for%20an%20Illegal%20Act%20or%20Business.html provides some clarification as to the circumstances in which the Board will evict a tenant or occupant of the rental unit for an illegal act. With respect to collecting rent from these tenants, if they default on payment, you can serve them with an N4- Notice to End a Tenancy Early for Non-Payment of Rent.