Obstruct justice
Definition 1 of 1
Pro Tip 1/3Legal Trouble
Used when someone's actions could involve them in legal proceedings or increase legal difficulties. 
Tampering with the jury could lead you to obstruct justice.
Pro Tip 2/3Crime Context
Mostly used in criminal cases, less so in civil disputes. 
She was charged with obstructing justice by intimidating a witness.
Pro Tip 3/3Active Intent
It implies a deliberate action taken to disrupt the legal process. 
Deleting emails relevant to the investigation may be seen as obstructing justice.