Meanings of complain of marginalisation in English

Many Tamils complain of marginalisation since then.

Many Tamils complain of marginalisation by governments led by the Sinhalese majority since independence from Britain in 1948.

Both opposition movements complain of marginalisation.

The Banyoro, who have historically complained of marginalisation, deprivation and neglect, want a 10 percent cut of the petrodollars and more power for their monarch.