A quick news snippet from 2011

As the video alludes:

In January 2011, workers there were among the first to protest - prompting the mass protests that in turn developed into a revolution and led to the departure of Hosni Mubarak, the Egyptian president.

The article i just linked also goes over its history briefly, like the first strike workers in a textile factory had in 1938.

This activity in Mahalla was part of a larger rise in labour activity:

Soon after the uprising began, workers violated ETUF’s legal monopoly on trade union organization and formed the Egyptian Federation of Independent Trade Unions (EFITU)—the first new institution to emerge from the revolt. ... Facilitated by the government’s closure of all workplaces in early February, many workers participated in the popular uprising as individuals. On February 6 they returned to their jobs; just two days later, EFITU called for a general strike demanding that Hosni Mubarak relinquish power. Tens of thousands of workers—including those employed at large and strategic workplaces like the Cairo Public Transport Authority, Egyptian State Railways, the subsidiary companies of the Suez Canal Authority, the state electrical company, and Ghazl al-Mahalla—answered the call, engaging in some 60 strikes and protests in the final days before Mubarak’s fall on February 11.

Things didn't calm down in mid 2012 after Morsi (from the Muslim Brotherhood) took office:

In the video, a female worker expresses her disillusionment with the Islamist president who only cares about a tiny wealthy elite. “The first thing he does when he gets his hands on the presidency is to forget about us. He’s only thinking about those earning 200,000 or half a million. He doesn’t think about the workers who are sweating blood. Where are our rights? We can’t even afford a crust of bread. Where is our president now? We want the minimum wage. Not one of our demands has been met.”

A male colleague adds: “The revolution didn’t bring anything to the workers of Misr Spinning in Mahalla. Back in 2006, we were getting profit-sharing bonuses of four and a half months. Other people are getting more and we’re getting less. How can they bring in someone like Fouad Abd-al-Alim [the new head of the public sector Holding Company for Textiles and Garment Production]? He was the most corrupt one here. He destroyed the factory in Mahalla and is destroying the rest of the public textile factories. The workers here are making the revolution again from the start. The coming revolution will be a workers’ revolution.”

In December of that year:

Protesters in Mahalla, the largest industrial city in Egypt, threw out the head of their city council, Friday night, and announced their autonomy from the “Muslim brotherhood” state.

“We no longer belong to the Ikhwani state,” they announced from the city council.

...

In the industrial city of Mahalla al-Kubra in the Nile Delta, thousands of workers and youth cut railways and blocked the entrances of the city. According to media reports, protesters stormed the city council and declared the city “independent” from the “Muslim Brotherhood state.” They announced plans to elect a “revolutionary council” to organize the city’s affairs.

Around november 2012, in an effort to pass a constitution which sparked opposition because it was seen as too islamist, Morsi tried to acquire power that would allow him to circumvent judicial review and pass his new constitution.

This culminated in mass protests against him in mid 2013 and on July 3 2013, he was ousted by a military coup led by minister of defence General Sisi, who would become president/dictator in 2014.

I don't know much about the egyptian revolution, but the general impression I have is that while mubarak was ousted in 2011, the military still held a lot of power, and so when Morsi became more trouble than he was worth, and popular sentiment rose against him, the military seized the opportunity to reassert itself.