Dale Sky Clare, executive chancellor of the Oaksterdam University in California, on Tuesday warned that the federal government's crackdown on medical marijuana dispensaries could prevent thousands of qualified patients from having safe access to their medicine.

In letters received by 16 licensed California dispensaries and their landlords last week, U.S. Attorneys threatened to swoop in and seize the properties if they didn’t close up shop within 45 days. The move comes in the same week that the Internal Revenue Service took steps that may force Oakland’s Harborside Health Center, the nation’s largest medical marijuana dispensary, to shut down.

"What they are doing, for the most part, is actually going after very small businesses," Clare said on Fox Business. "They like to pretend its these giant facilities, we'll there might be one or two of those out there, but for the most part we are talking about small businesses that have been taxpayers for years -- in many cases over a decade. These folks have been members of their community providing safe access."

"The federal government would have you believe this is not an attack on patients," she continued. "Make no mistake, these sick patients cannot necessarily grow their own medication. Where are they supposed to find it? The back alley? The black market?"

Clare described the crackdown as a "war on patients."

Watch video, courtesy of Fox Business, below: