How did Sayyed Ali Khamenei become dictator?

Sayyed Ali Khamenei became the Supreme Leader of Iran in 1989 following the death of Ayatollah Khomeini, the founder of the Islamic Republic. Initially serving as president from 1981, Khamenei was able to consolidate power by leveraging his position within the Revolutionary Guard and aligning with key political and religious factions. Over time, he expanded the authority of the Supreme Leader, diminishing the powers of other branches of government and suppressing dissent, effectively establishing a dictatorial regime. His control over the military, media, and political institutions has allowed him to maintain a tight grip on power.