PantyFanatic,

Yes, I believe there are.

In the 17th & 18th centuries, Democracy began to supplant previous social systems of governance. The engineers of this transformation, which remains a work in progress, are often referred to as democrats.

In the 19th century, abolitionists advocated the emancipation of slaves. I have learned that some campaigned for this goal very forcefully.

In the first half of the 20th century, suffragists changed society by enfranchising women.

Beginning a the end of the 20th century, and continuing into this century, Western Civ (if you will excuse the term) is being transformed again to enable a greater, if not full, participation by people with handicaps.

There are others, depending upon how one defines social experiments, and their engineer advocates.

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Eudaimonia