The Free Trade Unions (Bulgarian: свободен синдикален съюз, SSS) was a central trade union organization in Bulgaria.
SSS was founded in August 1904, and was politically tied to the Bulgarian Social Democratic Workers Party (Obedinena).
[1] As of 1904, SSS had 1,188 members.
By 1907 the membership had risen to 1,884.
[2] This article related to one or more trade or labor unions is a stub.