Correct. Any institution that is not expressly anti-marxist eventually becomes marxist. Always.

Unless an institution is comprised of anit-marxist people who are wide awake to marxist tactics, that institution will be infiltrated and subverted over time until it is fully marxist-controlled.

It needs to be understood that as soon as one marxist gets into a position of power, they will immediately attempt to open the door for other marxists, and close it for non-marxists.