It was created in February 2010 predominantly by members of the Bulgarian Socialist Party. Its leader is Boyan Borisov Kirov. The party is full member of the Party of the European Left since September 2010.
- Българската левица (in Bulgarian).
- Approved as a full member by the Executive Board of the PEL in Luxembourg in September 2010. "Executive board met in Luxembourg: Countdown to the Congress", Party of the European Left, 2010-09-15. Retrieved on 2010-10-13. The decision was ratified by PEL's 3nd congress in December 2010. "EL elects new President and vice-chairpersons!", Party of the European Left, 2009-10-06. Retrieved on 2010-12-07.
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