Social interest means not only equality but also the awareness of being part of a whole.
Gemeinschaftsgefühl bedeutet nicht nur Gleichberechtigung, sondern auch das Bewusstsein, ein Teil eines Ganzen zu sein.

Psychologists
Alfred Adler
Austrian psychiatrist (1870-1937), founder of Individual Psychology. An early Wednesday Society member who broke from Freud in 1911 to build a system around inferiority, social interest, teleology and lifestyle.
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Source: 個人心理学講義 生きることの科学(1929年)所収「共同体感覚」章Verified