For about 94,000 of the 100,000 years of human history, people lived and organised themselves as hunter-gatherers without a centralized leadership apparatus. Hunter-gatherers began the transition to early chiefdoms and embryonic states between 3,000 and 6,000 years ago. Only in the previous 100-500 years have there been state-level polities.
The World Socialist Movement doesn't have a leader, and nor do any of the Companion Parties, because leadership is undemocratic. If there are leaders, there must be followers: people who just do what they are told. In the World Socialist Movement, every individual member has an equal say, and nobody tells the rest what to do. Decisions are made democratically by the whole membership, and by representatives or delegates. If the membership doesn't like the decisions of those it elects, those administrators can be removed from office and their decisions overridden.
Only when people have real, democratic control over their own lives will they have the freedom that is socialism.
Never a follower be
In these we trust?