What is free-trade according to Marx and Engels?

According to Marx and Engels, free trade refers to the removal of barriers to international trade, allowing goods and capital to move freely across borders. They argued that free trade benefits capitalists by facilitating their pursuit of profits through access to cheaper labor and resources, but also leads to exploitation of workers and uneven development between nations. Marx and Engels believed that true free trade under capitalism would only deepen inequalities and reinforce the power dynamics of the ruling class.