"Justice has to be served. Period," the Detroit rapper said in a video posted on his Instagram and Twitter. "And if it's not, I don't think things are going to change or get better."
"I know I been protesting, I know a lot of us been out on the streets protesting and it's been a lot of unity, but I also see a lot of people with ulterior motives that look like undercover cops," he explained. "And we've all seen places where they've got them bricks conveniently located to wreak havoc, and I don't know what the ulterior motive is."
Sean also spoke about the history of slavery, discrimination in the "Southern states" and ending systemic oppression.
"That's how deep it goes back," he said. "So no wonder that a cop feels like they could kill a black man or woman and feel like it's a way of life."
On being a black man in America, Big Sean said, "I don't feel equal and I don't feel free."
"Of course, let's speak up and be heard, but things have to change. Maybe these rules have to get updated, maybe these laws have to get updated, [but] the government has to relay that foundation because it is a racist foundation right now," he continued.
Big Sean ended the video by thanking supporters of the Black Lives Matter movement, declaring, "I'm so proud to be black."