According to Wikipedia (so it must be true):

In June, McInnes disavowed the then-upcoming Unite the Right rally in Charlottesville, Virginia.[33] However, Proud Boys were at the August 2017 alt-right event, which was organized by white supremacist Jason Kessler.[34] Kessler had joined the Proud Boys some time before organizing the event.[35][36][37] McInnes said he had kicked Kessler out after his views on race had become clear.

https://en.wikipedia.org/wiki/Proud_Boys

However, this is quite troubling:

The Proud Boys have a four-degree initiation process for new members.[15] In the first degree, a recruit must declare "I am a Western chauvinist who refuses to apologize for creating the modern world."[16] The second degree involves five or more Proud Boys punching the recruit until he names five breakfast cereals. To earn the third degree, the recruit must get a Proud Boy tattoo.[17] The Proud Boys' website says that the fourth degree is reserved for those who have "endured a major conflict related to the cause."[18][19] The Southern Poverty Law Center has said this requires the recruit to get into a physical fight with an Antifa activist at a public rally.

Kind of explains the eagerness to mix it up with Antifa that is seen on the video of what happened on Friday.