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I don't know where you picked that information up but it doesn't reflect the actual history of the Brotherhood.
The Muslim Brotherhood was always deeply political which is why various Egyptian Governments from the1940s to the 2010s, including that of Nasser, the most charismatic and popularArab Nationalist leaders, spent so much time suppressing them and killing their leaders.
It was Sisi, the current Egyptian dictator, who overthrew the elected Brotherhood government of Mohammed Morsi, which had won the election after the downfall of Mubarak, then had Morsi jailed and murdered; and had hundreds who came out on the streets to protest agaist the coup massacred.
"Following massive street protests, Morsi was ousted by a military coup in July 2013, after only one year in office. Brotherhood supporters and others opposed to the coup staged massive sit-ins, which were violently dispersed by security forces. More than 800 people were killed in what Human Rights Watch described as “one of the world’s largest killings of demonstrators in a single day in recent history.”
www.wilsoncenter.org