Ali (a.s.) belongs to all Islamic denominations and even non-Muslims
Love of the Commander of the Faithful (peace and greetings be upon him) and showing respect to this great man in the history of humanity and Islam is neither particular to Shias nor to all other Muslims. Rather, it is something that all liberated people throughout the world share with one another. You can see that those personalities who are not Muslims show respect to this bright personality and this golden sun. They write books and compose poems about him. It is completely wrong if the Commander of the Faithful (a.s.) becomes a tool for discord among Muslims. That great man was a personality whom all Muslims and all Islamic denominations love and dearly respect with all their hearts and souls.