The Relationship Between Hamas and Islamic Jihad

Hamas and Islamic Jihad were vaguely aligned for the better part of the last 10 years. They both have a similar ideology, they're both Islamist and they're against the existence of Israel. But in 2018, 2019, 2020, after Hamas hadn't done anything for years, Islamic Jihad started gaining a lot of traction. This coincides with Iran's development. And what essentially happens is things almost break down between the two.