Sit-down strike - in this strike the workers who are on strike sit at their designated workstations and refuse to move. This stops the bosses replacing them with strikebreakers or casual workers.
Sit-in (strike) - a group of workers simply occupy an area and refuse to leave until their demands are met. It's usually just referred to as "staging a sit-in".
Also note that redundancies are also known as "layoffs".
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