During reconstruction congress feared that pardoning former confederates would result in the suppression of black rights what happened to reinforce those fears?

Congress were fearing suppression of Black rights when the Black Codes happened.

The Black Codes were a set of laws approved by the Southern States in the Reconstruction Era in order to replace the slave codes without much change. In these laws, African Americans were to be forced to do labor on low wages. These also restricted Blacks from voting, getting an education and receiving equal treatment under the law.

frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. but frederick disliked rifle shooting and horseback riding. unlike his father, he was interested in french literature. he enjoyed poetry and music and, like some others of the enlightenment, he scoffed at religion. his father thought him soft, frivolous and unmindful of his duties. and when frederick refused to put his signature on a right to succession, for a few moments his father strangled him.