You're using the term incorrectly. Islamic Jihad is just one group, based in Lebanon and Gaza. It is not Hamas, it is not the PLO, it is not the Muslim Brotherhood, it is not Al Qaeda (or any of its offshoots), and it is not ISIS.
If you mean "jihadists" (note the lowercase), you mean all Muslims who take on a act of spiritual struggle, not necessarily connected to violence at all. "Jihadist" has come to mean someone who takes on an armed struggle in the name of Islam, but many ordinary Muslims object to that use because they use it to mean a spiritual journey.
You might also mean "Islamists"--which is the term that refers to those who make Islam a political goal.
But, at any rate, "Islamic Jihad" is not what you mean, because you are obviously making a vague reference to a large group and Islamic Jihad is just that small subset in Lebanon and Gaza.