Collocations for misconduct - noun

alleged
gross, serious
She was fired last year for gross misconduct.

criminal
financial, professional, scientific, sexual
research
police, prosecutorial (AmE)

dismiss sb for, fire sb for, sack sb for (BrE)
deny
The directors all deny financial misconduct.

misconduct by
allegations of misconduct by the security forces

misconduct on the part of
There was no misconduct on the part of the police.

on (the) grounds of misconduct (esp. BrE)
Staff can lose their jobs only on grounds of professional misconduct.