SWP /ˌes dʌb ə ljuː ˈpiː/ BrE AmE abbreviation for , Socialist Workers Party
a British political party that is very ↑ left-wing . It is known for producing a newspaper called Socialist Worker , which is sold by its members on the street, and for always being involved in political ↑ demonstration s (=when a big crowd of people publicly protest about something) .