LOS ANGELES — In the garage of a Murrieta house last fall, Matthew Chen opened a PowerPoint presentation on his computer for a group of men.
A caption on the screen was a vulgar insult directed at the Bureau of Alcohol, Tobacco and Firearms and Explosives. The first slide read, "Everything you are not supposed to know about suppressors."
The gathering was a meeting of the Cali Bois, a group associated with the "boogaloo" movement — a loose collection of extremists who espouse the violent overthrow of the U.S. government.
