Movemento pola Base (English: Movement for the Grassroots, MpB) is a Galician pro-independence and left-wing political organization.
The MpB was born in the summer of 2006 from a group of militants of the Galician Nationalist Bloc (BNG), critical with the political line of the organization at the time.
The participation of the BNG in a government with the Galician Socialist Party (PSdG) in the Xunta de Galicia created a critical current in the nationalist front.
In 2006 finally several militants of the Galician People's Union decided to leave that party to create a new organization within the BNG, under the name of Movemento pola Base (MpB).
[2][3] Between the months of December 2008 and January 2009 this current split between those in favor of creating a new political formation outside of the BNG and those who advocated to continue within that front.