Completed the following sentence: Afghanistan witnessed a period of rising political instability that began with the overthrow of King Zahir Shah in 1973. During the period, Afghanistan witnessed a massive growth in the size of its communist movement, particularly in the ranks of the Afghan military.<unk> During the period, Afghanistan witnessed a massive growth in the size of its communist movement, particularly in the ranks of the Afghan military. ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
1978 Saur Revolution, where by members of the People's Democratic Party of Afghanistan, a Soviet-backed Marxist<unk>Leninist party, seized power in a bloody coup.