In recent days, Black Lives Matter movement protesters have taken to the streets after the killing of George Floyd in Minneapolis, Minnesota. However, news of violence and looting has taken over the protesters' efforts to speak out against police killings of Black people and systemic racism.

As videos began to surface of Black protesters pleading with white people to stop vandalizing businesses and property, it became apparent that other groups were responsible for some of the damage.

One group in particular, antifa, short for anti-fascists, has been criticized for causing damage to businesses in multiple cities across the U.S.

Here are four things you should know about the antifa movement: