Boston protest

Counterprotesters holds signs at a “Free Speech” rally by conservative activists on Boston Common, Saturday, Aug. 19, 2017, in Boston. Thousands of counterprotesters marched through downtown Boston on Saturday, chanting anti-Nazi slogans and waving signs condemning white nationalism ahead of a rally being staged by conservative activists a week after a Virginia demonstration turned deadly.

A counterprotester, part of a small group who remained on the street hours after a “Free Speech” rally was staged by conservative activists, scuffles with a security guard and police, Saturday, Aug. 19, 2017, in Boston.

Organizers stand on the bandstand on Boston Common during a “Free Speech” rally staged by conservative activists, Saturday, Aug. 19, 2017, in Boston. Counterprotesters stand along barricades ringing the bandstand.

Counterprotesters hold signs and chant at the Statehouse before a planned “Free Speech” rally by conservative organizers begin on the adjacent Boston Common, Saturday, Aug. 19, 2017, in Boston.

Police move toward a counter-protester, right, near a “Free Speech Rally” staged by conservative activists, Saturday, Aug. 19, 2017, in Boston.

Police escort an injured man who was assaulted while arguing with counterprotesters long after a “Free Speech” rally was staged by conservative activists, Saturday, Aug. 19, 2017, in Boston.

A man wearing a T-shirt bearing the name of President Donald Trump, right, is hit by a flying plastic bottle of water near a “Free Speech” rally staged by conservative activists, Saturday, Aug. 19, 2017, in Boston.

Thousands of protesters march in Boston on August 19, 2017 against a planned “Free Speech Rally” just one week after the violent “Unite the Right” rally in Virginia left one woman dead and dozens more injured.

A counterprotester holds a photo of Heather Heyer on Boston Common at a “Free Speech” rally organized by conservative activists in Boston on Aug. 19, 2017.

State and local police stand in front of a parade of counterprotesters arriving at Boston Common where a “Free Speech” rally organized by conservative activists was being staged in Boston on Aug. 19, 2017.

Thousands of protesters march in Boston on August 19, 2017 against a planned “Free Speech Rally” just one week after the violent “Unite the Right” rally in Virginia left one woman dead and dozens more injured.

Protesters with opposing views face off at a “Free Speech” rally organized by conservative activists on Boston Common on Aug. 19, 2017.

Counter-Protestors of the Boston ‘“Free Speech” Rally gather in Roxbury at the Reggie Lewis Athletic Center before marching to the Boston Commons on August 19, 2017.

Counter-Protestors of the Boston “Free Speech” Rally gather in Roxbury at the Reggie Lewis Athletic Center before marching to the Boston Commons on August 19, 2017.

BOSTON, MA - AUGUST 18: Candles are adroned with a picture of Heather Heyer at a vigil and march at the New England Holocaust Memorial to denounce hate groups before a controversial rally tomorrow on August 18, 2017 in Boston, Massachusetts. Heyer was killed last Saturday when a car rammed into a crowd of counterprotesters at a white nationalist rally in Charlottesville, Virginia. A free speech rally planned on Saturday on Boston Common has sparked fears of possible violence only a week after racially charged protests in Charlottesville, Virginia, turned deadly. Thousands of counter protesters are expected to attend the event which police vow to keep peaceful. (Photo by Spencer Platt/Getty Images) ** OUTS - ELSENT, FPG, CM - OUTS * NM, PH, VA if sourced by CT, LA or MoD **  (Spencer Platt / Getty Images)