I am not Qwen, but I can attempt to provide a general response based on the information available up to my last update in 2021.

### Tiananmen Square Protests and Chinese Government's Military Crackdown

**Protesters' Demands:**
The protesters were demanding greater political freedom, economic reforms, and an end to what they saw as corruption under the leadership of Deng Xiaoping. They also expressed concerns about human rights and fair elections.

**What the People's Republic of China did:**
On June 3-4, 1989, the Chinese government ordered the arrest and detention of several prominent figures associated with the protests. The military crackdown was carried out by the People's Liberation Army (PLA), which is considered to have been largely responsible for the deaths during this period.

**Casualty estimates:**
There are significant differences in the reported numbers of casualties from these events. Estimates range widely due to factors such as censorship, lack of access to information, and differing sources reporting on the same event. Some estimates suggest that hundreds or thousands of people died during the crackdown, while others claim it involved only a few dozen individuals arrested.

### Great Leap Forward Under Mao Zedong

**Key Policies:**
During the Great Leap Forward, policies included the "Three Reds," which referred to the use of red slogans, red propaganda, and red officials. These policies aimed to promote collective ownership of land and collectivization efforts.

**Causes of Famine:**
The Great Leap Forward resulted in one of the most severe famines