A strike is a work stoppage caused by the refusal of employees to perform work. Strikes first became important during the industrial revolution, when labor became important in factories and mines. Strikes were quickly made illegal in most countries, as factory owners had much more political power than workers. Most western countries partially legalized striking in the late 19th and 20th centuries.
Strikes were used to put pressure on governments to change politics.
Examples: The Gdansk shipyard strike led by Lech Walesa. This strike was significant in the struggle for political change in Poland, and was an important mobilized effort that contributed to the fall of governments in communist East Europe.