Original:  By 15 July 1927, the Wuhan regime had also expelled the Communists in its ranks, effectively ending the KMT's four-year alliance with the Comintern and the Chinese Communist Party .
Revised:  By 15 July 1927, the Wuhan regime had also expelled the Communists in its ranks, effectively ending the First United Front, a working alliance of the KMT and the CPC under the tutelage of Comintern agents .
Edit intent: clarity