High Quality Content by WIKIPEDIA articles! The 2008 attacks on Uttar Pradeshi and Bihari migrants in Maharashtra began on 3 February 2008 after violent clashes between workers of two political parties—Maharashtra Navnirman Sena (MNS) and Samajwadi Party (SP)—at Dadar in Mumbai, capital of the Indian state of Maharashtra. The clashes took place when workers of MNS, a splinter faction formed out of the Shiv Sena (a major political party of Maharashtra), tried to attack workers of SP, the regional party based in Uttar Pradesh, who were proceeding to attend a rally organised by the United National Progressive Alliance (UNPA). Defending his party’s stand, MNS chief Raj Thackeray explained that the attack was a reaction to the "provocative and unnecessary show of strength" and "uncontrolled political and cultural dadagiri (bullying) of Uttar Pradesh and Bihar migrants and their leaders".