After graduation, Gharib became a public secondary school teacher in chemistry, first in the city of Saida in the south where he taught Ibrahime Al-Amine, the current general director of Akhbar newspaper.
Afterwards, he moved to teach in Beirut in the public and the private sectors.
He remained an active teacher despite the big load that he had after becoming the Leader of the League of Public Secondary Teachers and later the coordinator of the Syndicate Coordination Committee that was formed between the union and leagues of public and private teachers and the public employees.
Under his leadership, the unions organized continuous demonstrations demanding increases in the wages and proposing progressive taxes and more taxation on the interests and real estate companies.
The popular movements lasted from 2012 till 2015 with diverse actions including sit-ins, demonstrations, and general strikes.
In addition to the governmental and presidential palaces, the ministry of finance and the ministry of education, the demonstrations  reached the economic ports of the country like the sea port and the airport.

Due to escalating discourse and action against the government and persisting stances on the rights of the teachers and employees, the political parties loyal to the government formed a large coalition in the teachers syndicate elections to defeat Hanna Gharib and they succeeded in doing so  after forming a list supported by 11 parties against the list of Gharib which got 46% of the votes despite all odds.
This ended Gharib's career in the leadership of the unions.

During this time, Gharib was a leading member of the Lebanese Communist Party where he raised in ranks to its central committee then its political bureau for two terms.
With increased public presence and media coverage, he was a well-known public figure in Lebanon especially among the communists and left-wing supporters.

After the party's 11th conference in April 2016, Gharib was elected by consensus as the general secretary of the party.
He is the seventh leader of the party after Fuad Shemali, Farajallah el-Helou, Nicolas Shawi, George Hawi, Farouk Dahrouj, and Khaled Hadadi.
After graduation, Gharib became a public secondary school teacher in chemistry, first in the city of Saida in the south where he taught Ibrahime Al-Amine, the current general director of Akhbar newspaper. Afterwards, he moved to teach in Beirut in the public and the private sectors. He remained an active teacher despite the big load that he had after becoming the Leader of the League of Public Secondary Teachers and later the coordinator of the Syndicate Coordination Committee that was formed between the union and leagues of public and private teachers and the public employees. Under his leadership, the unions organized continuous demonstrations demanding increases in the wages and proposing progressive taxes and more taxation on the interests and real estate companies. The popular movements lasted from 2012 till 2015 with diverse actions including sit-ins, demonstrations, and general strikes. In addition to the governmental and presidential palaces, the ministry of finance and the ministry of education, the demonstrations  reached the economic ports of the country like the sea port and the airport.
Due to escalating discourse and action against the government and persisting stances on the rights of the teachers and employees, the political parties loyal to the government formed a large coalition in the teachers syndicate elections to defeat Hanna Gharib and they succeeded in doing so  after forming a list supported by 11 parties against the list of Gharib which got 46% of the votes despite all odds. This ended Gharib's career in the leadership of the unions.
During this time, Gharib was a leading member of the Lebanese Communist Party where he raised in ranks to its central committee then its political bureau for two terms. With increased public presence and media coverage, he was a well-known public figure in Lebanon especially among the communists and left-wing supporters.
After the party's 11th conference in April 2016, Gharib was elected by consensus as the general secretary of the party. He is the seventh leader of the party after Fuad Shemali, Farajallah el-Helou, Nicolas Shawi, George Hawi, Farouk Dahrouj, and Khaled Hadadi.
Hanna Gharib