Can HOA Tow My Legally Parked Vehicle Due to a Roomate's Illegal Parking

[CMED]

My question involves a condominium located in the State of: MD
I LIVE IN A TOWNHOUSE WHERE WE ARE ASSIGNED ONE PARKING SPACE; AND THE ABILITY TO PARK IN ONE UNMARKED SPACE IF AVAILABLE. MY ROOMATE HAS EXPIRED TAGS AND THE HOA THREATENED TO HAVE HIS CAR TOWED IF IN THE PARKING LOT. HOWEVER, HIS CAR WAS NOT TOWED - MY LEGALLY REGISTERED AND TAGGED VEHICLE WHICH WAS PARKED IN MY ASSIGNED SPACE WAS TOWED. HOW CAN THEY HOLD ME RESPONSIBLE FOR SOMEONE ELSE'S CAR? THEY HAVE THREATENED TO TOW MY CAR AGAIN IF MY ROOMMATE PARKS IN A VISITORS SPACE AGAIN. IS THIS LEGAL???

[Mr. Knowitall]

When you asked them why they towed your car, what did they say?

[CMED]

The HOA said the tow company was told to tow both vehicles, but they only got to mine. They said I was warned about the illegal parking of my roomate and I was the homeowner so I would be held responsible.