The 1957 civil rights deal gave moderates a provision allowing Black citizens to serve on federal juries while retaining jury trials for Southern election officials, which kept the bill weak enough to avert a Southern filibuster.

“And moderates got a clause guaranteeing that black citizens could serve on federal juries so that they could tell voters that they had created a new civil right. Meanwhile, the jury trial guarantee for southern election officials stayed in, which kept the bill weak enough that southerners agreed not to filibuster it.”