system
A chat on subreddit /r/NoStupidQuestions
human
&gt;And ubfortually, pure communism makes it really easy for curroption to form.

Not trying to defend communism here, but that describes most economic/political systems.
gpt
I mean not really. The whole benefit of Democracy is the stratification of power which usually makes it much more difficult for corruption to fester. 

Marxist communism requires public ownership of the means of production which basically just gives the government more power, which leads to corruption. 

Government oversight of private companies does a good job in minimizing corruption as long as the agency regulating the business is untouchable by businesses' money which is a difficult problem to solve. Many western democracies solve that problem by limiting lobbying and measures like that, but even without as effective of measures corruption is still limited by democratic processes. 

Communism is a system which in order to function requires giving near absolute power to one entity, which is the state. Marxism doesn't work because it assumes the best intentions in all people. While modern societies don't necessarily assume the worst, there is a culture of "Trust but verify" with various agencies, businesses, and government checks and balances auditing each other. 

Corruption will exist in any system of power, but countries that attempt to collectivize wide swaths of industries are particularly vulnerable to it.