In my county in MD, we have a County Police Auxiliary. They have uniforms very similar to the AA Co Police, but no weapons. In emergencies, they handle routine police work, like directing traffic, for example, while the regular AA Co Police deal with the emergency (such as a riot).
These BAC seem to be just the opposite: They don't have uniforms (except for their arm bands), they are armed, and they are attacking the gilet jeune protesters while the regular flics and even the Gendarmeier Riot Police stand by and do nothing.