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.