Verses with the word conspiracy in the Old Testament (9 verses):

2 Samuel 15:12
And Absalom sent for Ahithophel the Gilonite, David's counsellor, from his city, even from Giloh, while he offered sacrifices. And the conspiracy was strong; for the people increased continually with Absalom.

2 Kings 12:20
And his servants arose, and made a conspiracy, and slew Joash in the house of Millo, which goeth down to Silla.

2 Kings 14:19
Now they made a conspiracy against him in Jerusalem: and he fled to Lachish; but they sent after him to Lachish, and slew him there.

2 Kings 15:15
And the rest of the acts of Shallum, and his conspiracy which he made, behold, they are written in the book of the chronicles of the kings of Israel.

2 Kings 15:30
And Hoshea the son of Elah made a conspiracy against Pekah the son of Remaliah, and smote him, and slew him, and reigned in his stead, in the twentieth year of Jotham the son of Uzziah.

2 Kings 17:4
And the king of Assyria found conspiracy in Hoshea: for he had sent messengers to So king of Egypt, and brought no present to the king of Assyria, as he had done year by year: therefore the king of Assyria shut him up, and bound him in prison.

2 Chronicles 25:27
Now after the time that Amaziah did turn away from following the LORD they made a conspiracy against him in Jerusalem; and he fled to Lachish: but they sent to Lachish after him, and slew him there.

Jeremiah 11:9
And the LORD said unto me, A conspiracy is found among the men of Judah, and among the inhabitants of Jerusalem.

Ezekiel 22:25
There is a conspiracy of her prophets in the midst thereof, like a roaring lion ravening the prey; they have devoured souls; they have taken the treasure and precious things; they have made her many widows in the midst thereof.