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.
右翼 is the general term for the political right wing or right-wing groups, while 街宣右翼 specifically refers to those that engage in street propaganda using loudspeaker trucks.
街宣車 is the propaganda vehicle itself, whereas 街宣右翼 denotes the organization or group that uses such vehicles.
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.