A new report has found prisoners organized over 100 strikes between March and June in response to dangerous conditions inside jails and prisons amid the pandemic. Perilous, a digital research and media group that authored the report, said prisoners rose up across 39 states, with most protests happening inside immigrant prisons.

Since the beginning of the pandemic, over 250,000 people in jails and prisons have tested positive for the coronavirus, and over 1,400 prisoners and staffers have died. Perilous referred to the uprisings as “clearly one of the most massive waves of prisoner resistance in the past decade.”