The primary mass base of the MKP was the peasantry of NWFP and the organised workers of Punjab. The peasants were mostly directly members of the party while the workers were organised through other organisations affiliated with the MKP. The main worker mass organisation was the All Pakistan Trade Union Federation (APTUF) led by Mirza Ibrahim. Mirza Ibrahim was himself a member of the MKP’s Central Working Committee. The APTUF was the largest trade union federation in Pakistan and thus contributed greatly to the MKP.