FILE - In this June 19, 2020, file photo, people demonstrate in Chicago, to mark Juneteenth. A national coalition of labor unions, along with racial and social justice organizations, will stage a mass walkout from work July 20, as part of an ongoing reckoning on systemic racism and police brutality in the U.S. (AP Photo/Nam Y. Huh, File)

FILE - In this March 29, 1968, file photo, striking Memphis sanitation workers march past Tennessee National Guard troops with fixed bayonets during a 20-block march to City Hall in Memphis, Tenn. A national coalition of labor unions, along with racial and social justice organizations, will stage a mass walkout from work July 20, as part of an ongoing reckoning on systemic racism and police brutality in the U.S. The strike will continue a decades-old tradition of the American labor rights movement and most notably, organizers draw inspiration from the historic Memphis sanitation workers’ strike. (AP Photo/Charlie Kelly, File)

FILE - In this June 2, 2020, file photo, onlookers show their support as demonstrators march during a protest in Los Angeles, over the death of George Floyd. A national coalition of labor unions, along with racial and social justice organizations, will stage a mass walkout from work July 20, as part of an ongoing reckoning on systemic racism and police brutality in the U.S. (AP Photo/Jae C. Hong, File)

FILE - In this June 21, 2020, file photo, a protester carries a sign during a march in honor of Andres Guardado in Compton, Calif. A national coalition of labor unions, along with racial and social justice organizations, will stage a mass walkout from work July 20, as part of an ongoing reckoning on systemic racism and police brutality in the U.S. (AP Photo/Marcio Jose Sanchez, File)

FILE - In this June 7, 2020, file photo, protesters participating in a Black Lives Matter rally march to Downtown Pittsburgh from Mount Washington to protest the death of George Floyd. A national coalition of labor unions, along with racial and social justice organizations, will stage a mass walkout from work July 20, as part of an ongoing reckoning on systemic racism and police brutality in the U.S. (AP Photo/Gene J. Puskar, File)

FILE - In this June 14, 2020, file photo, Mel Packer of Pittsburgh tapes a sign on a vehicle in the parking lot of a Shop & Save in downtown Pittsburgh in preparation for the Pennsylvania Poor People's Campaign: National Call for Moral Revival. A national coalition of labor unions, along with racial and social justice organizations, will stage a mass walkout from work July 20, as part of an ongoing reckoning on systemic racism and police brutality in the U.S. (AP Photo/Gene J. Puskar, File)

FILE - In this April 15, 2015, file photo, protesters march in support of raising the minimum wage to $15 an hour as part of an expanding national movement known as Fight for 15, in Miami. A national coalition of labor unions, along with racial and social justice organizations, will stage a mass walkout from work July 20, 2020, as part of an ongoing reckoning on systemic racism and police brutality in the U.S. (AP Photo/Lynne Sladky, File)