150 th Birth anniversary ( HW QUEST.) sardar patel - Iron man of india national unity day = 31 oct ( declared in 2014 ) statue of unity successful lawyer entered in indian national movement after he was influenced with philosophy of mahatma gandhi 1918 = kheda peasant struggle 1928 = bardoli stayagraha 1931 = president INC karachi session 1st Home Minister , deputt. prime minister imp role in uniting 562 princily states under indian dominion leading member of the constituent assembly , recommended B.R. Ambedkar name in constituet assemblly imp role in estbalishing the indian admninstrative services and indian police services bharat ratna =1991