The simplest means is to deny that the means are aggressive. Deny the discrimination, claim responses are justified, dehumanise the group, reject any peaceful protestor as a disrespectful "son of a bitch" (https://www.washingtonpost.com/news/early-lead/wp/2017/09/22...), nonpeaceful resistance "thugs" (https://www.cbsnews.com/news/trump-minneapolis-protesters-th...) even where that represents a small minority, agents provocateurs, or responses to violence or entrapment.

Restrict access to institutions of power such as legislatures, the church, banks and financial institutions, civil service, the military, lower or higher education, business, the ballot box.

Use selection criteria which are impersonal but demonstrably discriminate against the class.

Locate polluting industry in neighbourhoods inhabited by the group. Especially contaminants (lead, mercury, asbestos, etc.) with long term cognitive and behavioural health effects.

Encourage (and prosecute) drugs trade and use in the group's ccommunities. Differentiate in prosecution and sentencing between "their" and "our" drugs.

Establish wholly separate "segregation schools" for the privileged group. Ensure that the privileged poor have scholarship access, but the disenfranchised group does not.

Create exclusions based on redlining, restrictive covenants, actuarial risk, AI, or other mechanisms reducing access to assets, insurance, business financing, and other opportunity-enhancing resources, often "objective" and "based in data".