https://www.vice.com/en_us/article/qj4mwm/detroit-teachers-authorize-safety-strike-over-school-reopening-fears

Detroit teachers voted overwhelmingly to authorize a "safety" strike if the state's largest school district doesn't allow all teachers to teach classes online during the pandemic. It's the latest in mounting tensions between teachers and school districts across the country over school reopening plans. 

On Thursday evening, 91 percent of Detroit teachers voted in favor of authorizing the 'safety' strike, which means teachers would refuse to teach in-person classes if the school district does not agree to implement a set of safety protocols before schools reopen on September 8.