Why did some conservatives accuse St. Paul VI of Marxism after Populorum progressio?

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Pope Paul VI stands behind microphones with both arms raised, wearing white papal robes and glasses, during a public appearance in Geneva. — St. Paul VI In 1968 Pope Paul VI appeared in Geneva to address the International Labour Organization on the 50th anniversary of its founding.

In his 1967 encyclical Populorum progressio ("Development of Peoples"), St. Paul VI issued a pointed plea for social justice and explicitly denounced the excesses of capitalism.12

Because of this strong critique of capitalist systems and his focus on the needs of the poor, some conservative critics accused the pope of Marxism. These accusations stemmed from the perception that his emphasis on systemic social reform and his challenge to existing economic structures aligned with Marxist ideology.12