Have fair-skinned peoples ever been the lower/oppressed class?

Russian Serfs were white.

Serfdom in Russia (Wikipedia)

It is officially ended in 1861. In some sense it was continued until 1907 when redemption payments were abolished.

The Catholic/Nationalist community in Northern Ireland was socially opressed by the dominate Protestand/Loyalist community for a lot of the 20th century. Both were white.

Another example is of the Hutu and Tutsi peoples of Rwanda we remember the recent genocide attempted by the Hutus who while both are African tribes and the Hutus are generally darker skinned they took turns over many generations oppressing each other killing thousands from both tribes over the years

Fair skinned people are oppressed and lower classes in most fair skinned societies and nations.

I'm born Australian and was born in the late 60s. Before multiculuralism took off in the 80s and 90s nearly all of the manual, dirty, dangerous and unpleasant jobs in our society were performed by white people. Most of the wealth went to a relative few white people. The upper classes looked down on the lower classes despite being the same ethnicities.

Now the wealth goes to lots of different ethnicities, but there are still a lot of white members of the "under class".

And yes tanning creams are (or were before the 90s or so) used by light skinned people as an attempt to convey higher social class.

Having a tan in winter in the UK indicated you had the wealth to travel to somewhere that had sun light.

Tanning cream may now be relatively common fashion accessory, but way back when a real tan meant exactly what you said - you had money to travel be able to afford to travel and to take the time to do so, which is why fake tans were originally so popular.

Ethnically differentiated rulers regularly reduce the status of the majority population, and often these peoples are constructed as racially identical in terms of late 19th century racial theories. See the Norman dominance over a predominantly Anglo-Saxon population in England for an example. (Here comes the new lord, slightly more Frenchified than the old lord).

For an example that uses the racial constructs from the 19th century exactly, wouldn't http://en.wikipedia.org/wiki/Mongol_invasion_of_Rus%27#The_age_of_Tatar_rule match your interests? Obviously neither the population of Rus nor the Mongols perceived of themselves in terms of 19th century racial categories.

Finally, societies that are perceived to be largely ethnically h*m*geneous regularly reduce the status of their own members, see the tribal crises of antiquity, or the regular internal subjugation of peasants into serfs, or the vast emiseration of the English working class during the period 1750 to 1850. This is class war as usual.

It's important to remember that the concept of "white people" (or fair-skinned people) as a single, all-encompassing term for Caucasians is a fairly recent development. As recently as a hundred years ago (or even today, in super-conservative areas), "white people" meant Anglo-Saxons, exclusively. People as closely-related as Irish or Germans may not have been considered "white," depending on the speaker and the context.

Plenty of empires in the south of Europe, such as Greece and Rome or Spain, held biases against their paler, northern "barbarian" neighbors like the Celts and the Germans. Even today, there are biases against redheads in many parts of the world. Terms like "pasty" and "pale" are almost always derogatory, so from a purely aesthetic standpoint there is a point at which darker skin is preferred over lighter skin in pretty much any culture.

If you're looking for a culture that generally believed "the darker the better," you'll need to check the other answers, but there are plenty of periods in which the powerful majority had consistently darker skin than the oppressed minority. Just think back to the Julius Caesar's (Italian) conquest of Britain, for a famous example.

I'm quite sure white people have been the target for lynch mobs and even ethnic cleansing in certain African nations. Zimbabwe and Uganda comes to mind, but I am quite certain white people are looked down on in many places in Africa, mostly due to a history of imperialism.

(Sadly, I don't have time to find sources right now).

Wikipedia documents the present day persecution of people with albinism in parts of East Africa.

"Persecution of people with albinism (sometimes abbreviated PWA[1]) is based on the belief that certain body parts of albinistic people can transmit magical powers. Such superstition is present especially in some parts of the African Great Lakes region, it has been promulgated and exploited by witch doctors and others who use such body parts as ingredients in rituals, concoctions and potions with the claim that their magic will bring prosperity to the user (muti or medicine murder).[2]

As a result, people with albinism have been persecuted, killed and dismembered, and graves of albinos dug up and desecrated. At the same time, people with albinism have also been ostracised and even killed for exactly the opposite reason, because they are presumed to be cursed and bring bad luck. The persecutions of people with albinism take place mostly in Sub-Saharan African communities, especially among East Africans.[3]:"

Well here is an African example of the darker the better. Southern Africa was invaded from the north by black tribes (intentionally no names as there were a number) who then oppressed the lighter skinned San, Koisan etc. The conquering tribes were agriculturalists while the indigenous people were mainly hunter gatherers. The black tribes also worked metal and went on to establish gold mining in conjunction with Arab traders. This dominance continued until the Dutch invaded from the south by ship. The indigenous people were used as slaves, particularly of the Xhosa, who seem to have picked up the click used in their language from the slaves. There was also interbreeding as the Xhosa often have features similar to the indigenous peoples. The Xhosa were part of the Nguni people and led the invasion down the east coast, with the Zulus behind them. They were very warlike and caused the invading Europeans many problems for all that they had no firearms. I have been vague about the dates as there was no written history of when the blacks moved south and it was a very slow migration. The Europeans encountered the Xhosa at the Fish River in South Africa around the 1700’s. Also note I have used common Western spelling for the black tribes.

In 1627 a Turkish pirate ship attacked Icelandic coastal villages. Hundreds of people were killed and 300 more were taken hostage and sold as slaves in Africa. A priest from the Westman islands(a group of small islands in Iceland's south) was amongst them, he managed to escape from Algiers, through Italy, France, Holland and then to Denmark from where he got back to Iceland. He wrote down his memoirs in a book called Reisubok, which quite accurately describes his journey.

Sources:
Reisubok: http://reisubok.net/Home/default.aspx,
Wikipedia: http://en.wikipedia.org/wiki/Turkish_Abductions

The Barbary Pirates raided as far north as Iceland and Scotland to capture slaves. While still Caucasian, North Africans typically have darker skin than northern Europeans.

Oppression is all about political power, so really its just a matter of one group conquering another. Which of the two groups happens to do the conquering is just a matter of historical luck.

One good example of a darker-skinned group happening to do the conquering is the ancient civilization of Kush. The Kushites were a Nubian people, speaking a Nilo-Saharan language. Melanin doesn't preserve well in archeology, but modern speakers of these languages are about as dark-skinned as human beings come.

The Kushites certianly did their time as Egptian vassals themselves. However, sometime around 727 BCE they invaded Egypt, starting an 80 year period where they ruled the country as the 25th Dynasty.

Maximum extent of Kush in 700 BC

The Ainu people come to mind, an ethnic minority in Japan.

Wikipedia says "Full-blooded Ainu are lighter skinned than their Japanese neighbors", and talks about "the long history of the oppression of the Ainu people by Japan's majority".

When the Moors conquered and ruled Spain, most Spanish were lighter-skinned than the ruling Moors. Moors denied education, at least to Christian Spaniards, in the part of the country they controlled, and Granada was considered "too beautiful for Christian eyes."

Also, the Mongols conquered and oppressed large parts of the former Soviet Union (especially the Ukraine), whose people were lighter-skinned than them.