The Black Legend
Great post over at Ibidem on the Inquisition, the Black Legend, and Masons. In it, Jesus Gil points to the work of RW Thompson as the source for the "millions of people killed during the Inquisition" line that McCabe and Hunt use, and Mac Swift (and others) repeat. But he refers to other scholarship which shows that "in the 350 years of the Spanish Inquisition, only between 3,000 and 5,000 people were killed, while at the same time the rest of Europe burnt 150,000 women for witchcraft alone."
The entire post is well-worth a read.