marginalising BrE
marginalizing AmE

I feel it contributes to a marginalising of groups which them cause stigma and targeting.

'The year 1992 symbolises the continued brutalising and marginalising of people throughout the world,' affirmed our Central Committee after its meeting in Quito, Ecuador, last June.

I should like to take this opportunity to emphasise that the gagging and marginalising of the democratic opposition in Azerbaijan can, in time, have serious political consequences, not only at national level, but just as much at regional level.