This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To organize (an economy, industry, or enterprise) on the basis of collectivism.

v. To organize a farm or industrial enterprise on the basis of collective control

v. to bring under collective control; to organize for operation by the principles of collectivism; -- especially of farms and industrial enterprises.

v. bring under collective control; of farms and industrial enterprises

"Personal responsibility is a real problem for those who want to collectivize society and take away our power to make our own decisions, transferring that power to third parties like themselves, who imagine themselves to be so much wiser and nobler than the rest of us."

collectivized    collectivizes    collectivizing   

organise    organize   

collectivism   

collectivise