In Scotland, the Scottish National Party (SNP) is a centre left, social democratic political party which campaigns for Scottish independence.The SNP has controlled Scotland's devolved legislature since the 2007 election as a minority government, and since the 2011 election as a majority government.he first term of the Scottish Parliament did not offer the SNP much comfort. Two MSPs quit the party, Margo MacDonald and Dorothy-Grace Elder, citing the actions of some of their colleagues as reasons for their resignations.