The driver was told Thursday he'd be disciplined for his actions.
A central board member of the University Student Judiciary raised alarm at the suspensions.
At least one positive case has been identified on Cumberland's seventh floor.
The union that protects UMD workers blasted the guidance as "paternalistic" and "out of touch."
Some were following in the footsteps of their grandparents, who participated in the 1963 march.
The university has been offering free coronavirus testing to all campus community members every weekday since Monday, and it will continue to do so through Sept. 4.
Union members rallied at a protest in College Park on Tuesday.
"If it has to happen, then we’ll vigorously defend them in the courts.”
Neijma Celestine-Donnor left the position July 31.
Students have reached out to lawyers, flooded social media feeds and organized email campaigns to raise awareness.