Gangs? Your first link said it was gangs. It also quoted several on the left condemning the violence.
Did you condemn the violence when protestors were sucker punched by Trump supporters?
From this
list of violence at Trump rallies....I counted eleven acts of violence by Trump supporters...and three by the protestors and one where both sides used pepper spray at the same rally...and two involving reporters.
17. May 28, 2016 in San Diego, California. Trump supporters pepper-sprayed protesters outside a rally.
14. April 23, 2016, in Bridgeport, Connecticut. A protester was pulled away in a chokehold by a police officer after reportedly trying to run back into a Trump rally he was being escorted out of.
13. April 11, 2016, in Albany, New York. A protester at a rally was shoved in the face twice by a Trump supporter. Video:
12. March 19, 2016, in Tucson, Arizona. A protester at a Trump rally was sucker-punched and kicked by a 32-year-old man who was then arrested on an assault charge.
11. March 19, 2016, in Tucson, Arizona. A Trump security official and Trump campaign manager Corey Lewandowski appeared to grab and pull a protester at the same Tucson rally.*
10. March 9, 2016, in Fayetteville, North Carolina. A black protester being escorted out of a Trump rally was sucker-punched by a white bystander:
8. March 1, 2016, in Louisville, Kentucky. A black woman was surrounded and shoved by a number of individuals at a Trump rally.
6. Dec. 14, 2015, in Las Vegas. Individuals at a Trump rally yelled "Sieg Heil" and "light the mother****er on fire" toward a black protester who was being physically removed by security staffers. Video:
4. Dec. 3, 2015, in New York City. A security guard took a sign from and struck an immigration activist during a protest after a Trump event. Video:
3. Nov. 21, 2015, in Birmingham, Alabama. A black protester at a Trump rally was punched, kicked, and, according to the Washington Post, briefly choked. Video:
2. Oct. 23, 2015, in Miami. A man at a Trump rally knocked down and kicked a Latino protester.
1. Oct. 14, 2015, in Richmond, Virginia. Individuals at a Trump rally shoved and took signs from a group of immigration activists. One spit in a protester's face: