Sin incurred by tolerating adharma

One should not remain for even a moment in a place where irreligion is
flourishing. A wise person should not enter an assembly if he knows the
participants there are committing acts of impropriety. And if, having
entered such an assembly, he fails to speak the truth, speaks falsely or
pleads ignorance, he will certainly incur sin.
SB 10.44.9, 10