• 紛糾ふんきゅう — complication; confusion; becoming tangled (debate, issue)
• 糾明きゅうめい — investigation to clarify the truth
• 糾弾きゅうだん — condemnation; strong public criticism
• 糾合きゅうごう — rally; unite; gather together
• 糾ただす — to question; to correct; to call someone to account

With the thread radical 糸, 糾 carries the image of threads getting twisted and pulled together. From there it naturally extends to: tangled situations (紛糾), and also straightening things out by questioning or correcting (糾す / 糾明).