Plaid Cymru have excluded Neil McEvoy from the party for 18 months following a disciplinary hearing last week.
Mr McEvoy was already expelled from the party's Assembly group due to what the party described as an 'irrevocable breakdown of trust' and last Thursday went before a disciplinary committee facing four complaints relating to his conduct. Three complaints were upheld.
Today the party released a statement saying that the South Wales Central AM would be expelled for 18 months, which they said reflected the gravity of the complaints against him.
Mr McEvoy, who leads Plaid Cymru's group on Cardiff Council and was elected as an AM in 2016, described the expulsion as "an unbelievable abuse of process."
Mr McEvoy says he will be appealing the decision and will hold a fringe meeting at this weekend's party conference in Llangollen.