Yes, Joseph Stalin did not uphold his promises regarding free elections in Poland after World War II. During the Yalta Conference in February 1945, the leaders of the Allied powers—including President Franklin D. Roosevelt, Prime Minister Winston Churchill, and Stalin—discussed the post-war reorganization of Europe. Stalin agreed to the principle of free elections in Poland and other Eastern European countries, but he also aimed to ensure that a pro-Soviet government was established in Poland.
In practice, Stalin and the Soviet government exercised strong influence over Polish politics. By the late 1940s, they had installed a communist regime, suppressing political opposition and manipulating elections to maintain control. Thus, the expectation of genuine democratic elections did not materialize, and Poland was essentially a satellite state of the Soviet Union for several decades.