right-wing organization using propaganda trucks
Refers to right-wing groups that drive around in black vans (often called 'black vans' or 黒バン) blaring nationalist or political messages through loudspeakers. The term is specific to Japanese street-propaganda culture.
A black van belonging to a right-wing street-propaganda group was driving around blaring a speech at high volume.
Right-wing activists were doing street propaganda in front of the station.
Compound of 街宣 (がいせん, 'street propaganda') and 右翼 (うよく, 'right wing'). The term emerged in post-war Japan to describe right-wing groups known for their distinctive black loudspeaker vans.