A swelling outcry over the February 23 shooting of Ahmaud Arbery intensified after a cellphone video that purports to show the killing surfaced online Tuesday. Following the video's release, a large crowd of demonstrators marched in the neighborhood where Arbery was killed, and the state opened its own investigation, which the governor and attorney general pledged to support.

So what do we do when we learn about things like this? What can we do?