Antônio Carlos Peixoto de Magalhães (4 September 1927 – 20 July 2007), also known by his initials ACM, was a Brazilian politician.

[1] Magalhães was one of Brazil's most powerful politicians serving as a Minister for Communications, as Leader of the Liberal Front Party (PFL) and as President of the Federal Senate.

[4] In 1985, he switched allegiance to Tancredo Neves and helped José Sarney form the Liberal Front Party.

Magalhães became the Minister for Communications in Sarney's Government allowing him to grant radio and television licenses to friends and supporters.

[4] Magalhães also became the leader of the Liberal Front Party with the Social Democrat President of Brazil Fernando Henrique Cardoso relying on his support to pass legislation.