Sympathy for the Underdog, known in Japan as Bakuto Gaijin Butai (博徒外人部隊, "Outlaw Gambler-Foreign Legion"), is a 1971 Japanese yakuza film directed and co-written by Kinji Fukasaku and starring Kōji Tsuruta and Noboru Ando.

[2] The film's main character, Masuo Gunji, is an honorable old-school yakuza boss whose gang is driven out of Yokohama by a powerful rival from Tokyo.

However, after setting up a lucrative bootlegging operation in Okinawa, the yakuza family from Tokyo that was responsible for their previous downfall and Gunji's imprisonment comes to the island planning to seize control of the territory.

This ultimately led to the Yamaguchi-gumi, the largest criminal organization in the country, leading a ten-year war in Okinawa against other gangs.

"[5] Fukusaku biographer Sadao Yamane stated that Sympathy for the Underdog was originally developed as a sequel to Japan Organized Crime Boss, a Fukasaku film from 1969 also starring Tsuruta and Ando, until the director saw The Battle of Algiers.