Answer:
A leader can use physical and psychological violence, remove individual and collective liberties from citizens, instill fear and establish a government based on totalitarianism.
Step-by-step explanation:
To control population, a modern leader can base his government on physical and psychological violence. The leader can exercise constant and permanent vigilance over the life of the population, controlling even the personal and family life of individuals, that is, an extreme and radical case of authoritarianism.
In addition, this leader can end the personal and collective freedoms of the population, establish a strong censorship in the media, among other measures.