Analysis of information sources in references of the Wikipedia article "Ali Salih es-Sadi" in Turkish language version.
Although individual leftists had been murdered intermittently over the previous years, the scale on which the killings and arrests took place in the spring and summer of 1963 indicates a closely coordinated campaign, and it is almost certain that those who carried out the raid on suspects' homes were working from lists supplied to them. Precisely how these lists had been compiled is a matter of conjecture, but it is certain that some of the Ba'th leaders were in touch with American intelligence networks, and it is also undeniable that a variety of different groups in Iraq and elsewhere in the Middle East had a strong vested interest in breaking what was probably the strongest and most popular communist party in the region.
