Protesters flood Boston streets

The mayor emphasized his message of keeping the peace on Twitter.

Walsh on Friday said that if the rally got out of hand, it would be shut down, warning others to not confront alt-right demonstrators, in hopes of preventing any violence in the wake of the deadly rally in Charlottesville, Virginia.

Boston Mayor Marty Walsh hugs a counterdemonstrator during the rally Saturday morning.

Thousands of counterdemonstrators gathered at Boston Common in opposition of the free speech rally.

Aerial shots shows counterdemonstrators flooding the streets of Boston.

Counterdemonstrators shared messages of peace and love.