The Party Control Commission () was responsible for, in the words of the Party constitution, "... a) to oversee the implementation of decisions of the Party and the CPSU (b), b) investigate those responsible for violating party discipline, and c) to prosecute violations of party ethics." The 18th Party Congress, held in 1939, recognised that the central task of the Control Commission would be to enhance the control of the Party control. The congress decided that the Control Commission would be, from then on, elected by the Central Committee in the immediate aftermath of the Congress, instead of being elected by the congress itself. Changes were also made to the constitution. It stated that the "Control Commission a) oversaw the implementation of the directives of the CPSU, (b) and the Soviet-economic agencies and party organisations; c) examined the work of local party organisations, d) investigate those responsible for abusing party discipline and the Party constitution".