It's one of the oldest and best respected political action groups for Palestine - basically a focused boycott organizer, which focuses on boycotting specific companies intensely in order to force change
Basically, they argue for total boycotts of a select few companies that are very actively working with Israel's military, and support less intense pressure campaigns against other companies that aren't feasible to fully boycott (like Amazon or Google)
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https://bdsmovement.net/get-involved/what-to-boycott