This post timed out without being solved. The answer was “Under a Killing Moon” by Thrice.
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Title
War pigs by black Sabbath? Lyrics:
Generals gathered in their masses Just like witches at black masses Evil minds that plot destruction Sorcerer of death’s construction
A great guess, but while they have some similar imagery from this line, it is not the song! Here’s a hint: your song released in the 70s, my song was released in a different decade.