Was Biden 'Very Engaged' in the Civil Rights Movement?

Speaking in Pittsburgh, Pennsylvania, on Labor Day, President Biden touched on his involvement in the Civil Rights movement during his younger years—something he's done on numerous occasions. Each time, however, the president's comments prompt new rounds of fact checks. This time is no different. 

CLAIM: "And we know what happened was, about midway through my — I got elected to — I got very engaged in — in my case, the Civil Rights Movement. And — and as a kid, I was — I worked a lot in the movement at work."