1) Socialist party in Europe 
[party] ERK was a Muslim socialist party active in Bashkiria, Bukhara and Turkestan from 1919 to 1926. The party was established when two groups, simultaneously but independently of each other, decided to organize themselves into independent political formations in the Third International. The original groups based in Tashkent and Temjassov...
Erk is British RAF slang for an aircraftman, a recruit.
an aircraftsman of the lowest rank in the Royal Air Force. · a worthless, stupid person; jerk.