Relevant bit of history: Until 1971, Bangladesh used to be called East Pakistan and the current Pakistan was called West Pakistan. Both parts together made up Pakistan, but the East and the West didn't share a common language or culture. In 1952, the West tried to impose Urdu as the sole official language, which resulted in people protesting, and dying, to protect Bangla (Bengali) on Feb 21, 1952. This was eventually recognized by the UN as the International Mother Language Day
But the attitude didn't change, and after losing an election overwhelmingly to a political party based mostly in East Pakistan, the loser from the West worked with the military to not hand over the power and instead let loose The Pakistani Army, which, with the help of local collaborators (Rajakars), killed 3 million people
200,000 women in 1971. One of the stated reasons was to "Protect Islam."
Fast forward to 2012. Now there is a war-crimes trial going on for some of the top Rajakars, and like the Arab Spring, social media headed by young bloggers took a leading role in holding the war criminals accountable.
So the Rajakars, who predominantly belong to a party called Jamaat-E-Islami, are trying to inflame popular sentiment (which is overwhelmingly against them) through propaganda that all bloggers are Atheists. Their campaign is funded by huge influx of money from the middle east and a network of highly profitable businesses in Bangladesh. They own TV stations and newspapers that are using photoshopped images to show the alleged debauchery and insults to Islam of the so-called Atheists.
So this is not just a left vs. right issue as people elsewhere might interpret it. This is an active campaign for the Talibanization of Bangladesh along with a campaign to protect people who allegedly committed crimes against humanity.
The process is not to ban just rightist parties (there are plenty)--the process aims to ban Jamaat-E-Islami, which has never clearly stated that their role in 1971 (of helping with genocide and rape) was wrong, and which is headed by people who actively participated in the genocide and rape.
For freedom-loving people everywhere, this must not be allowed to stand. "Atheists bloggers" is just a red herring--don't let this cheap trick by alleged criminals muddy the water.