Robotniczy Klub Sportowy „Skała" ('Workers Sport Club "Rock"', abbreviated RKS) was a Jewish Communist sports organization in Wyszków, Poland, active during the interbellum years.
Founded in 1928, RKS was one of two Jewish sports organizations in the city (the other being Makabi).
[3] Just a few weeks after its foundation, the Poale Zion Left followers split away and set up a third Jewish sports organization in the city (Gwiazda).
[4] Its members were largely from the Jewish Section of the Communist Party.
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