SLP was active in campaigns to release political prisoners and detainees.
SLP was the first and the only political party in Sudan calling openly for a free market economy.
SLP published one of the most advanced economic programs in this field, calling for the creation of free-market zone projects in the border areas of Darfur and Eastern Sudan and programs of rebuilding the war-devastated areas based on free-market principles.
However, much of the SLP membership was concentrated in the Khartoum region, which is home to a fifth of the country's population.
Adil Abdel Aati was a prominent leader of the SLP and one of its best-known members.