A few machine guns would take care of this problem quite nicely.
How dare they even are allowed into the resting place of Voltaire.

Undocumented migrants calling themselves the ‘Black Vest’ protesters flooded the Pantheon in Paris and demanded the right to remain in France. The protesters vowed to remain on site until all of the illegals get proper papers.

"We will remain here until the last one of us has been given documents," a leaflet given out by an organiser read.

We, immigrants without papers, residents of shelters and of the streets, occupy the Panthéon, the graves of your great citizens...to demand the Prime Minister give papers to all undocumented migrants in France."

https://www.rt.com/news/464038-black-vest-protesters-occupy-pantheon/

https://www.nytimes.com/reuters/2019/07/12/world/europe/12reuters-europe-migrants-paris-protest.html

Migrant support group "La Chapelle Debout" (Standing Chapel) whose activists were also inside the Pantheon said 700 migrants and their supporters had gained entry to the building at the start of the afternoon and were surrounded by police.

In a statement, the group said they wanted papers and housing for everyone. "We do not want to have to negotiate any more with the interior minister and the prefectures," the group stated. "We want to talk to Prime Minister Edouard Philippe, now!"