[Landlord, US-IL] Tennant is holding "mass" in their apartment but I'm pretty sure they are participating in organized crime

Every sunday since one of my tenants moved in 3 months ago, he (a Catholic priest) has been holding mass in his room every morning. At first, it seemed legit, but then I started noticing some oddities.

Firstly, all the "church-goers" are Italians. Not damning on it's own, but in light of all the facts, it is suspicious. I've listened in on the mass a couple times through the wall of an adjacent supply closet. There is always gospel music blasting, and I think they are just using it so no one can hear what they're saying.

Then there's the Carmina incident. I cut out their power for a second during mass one day to lure them out of the room to the circuit breaker. They sent out a woman named Carmina to investigate. I intercepted her in the hallway and questioned her on the scripture. She could not name a single gospel verse! I ran her plates by my cop buddy and turns out her car was registered under a woman named Georgiana Stickens.

Finally, one day when the tennant was out, I snuck into his room and snooped around. I found a suitcase full of cash in his closet!

What do I do? The lease specifically says no organized crime, but if I kick him out, the mob may come after me.