A linebreaker is a "security contractor" employed by companies as hired muscle, basically performing acts of legally sanctioned
terrorism as a de-facto private
police force. Noteworthy accomplishments include the Ludlow Massacre, Battle of Blair Mountain, the Cable Street riots and at least
2 rigged elections in
Italy... one of which resulted in Mussolini's rise to power.
Most linebreakers are generally street thugs with improvised weapons and
small arms who coerce, threaten, assassinate and lynch striking workers. Linebreakers were (and still are) such a threat to democracy that laws such as The Pinkerton Act had to be passed to regulate them, since at their peak, the Pinkertons (now known as Securitas) employed more armed agents than the US armed forces.
Pleb 1: Hey did you hear about those mercenaries who tried to overthrow the Venezuelan
government and disclosed it to the government by posing tweets about it a few days later?
Pleb 2: Wow, sounds like the linebreakers are at it again.