What effect did the Enforcment Acts have in Southern states?

The first of the three acts was passed in March of 1870.
The Enforcement Acts were:

criminal codes that
protected blacks' right to vote, hold office, serve on juries, and receive equal
protection of laws. If the states failed to act, the laws allowed the federal government
to intervene.

One effect that this act had is that
many Ku Klux Klan members were brought in for trail but very few were convicted. Many
whites would not testify because they did not agree with the act and many blacks would
not testify because they were afraid of standing up against the
whites.

In several counties in South Carolina martial law
was declared and many Klansman were sent to jail, ran off, or were hit with warnings and
fines. By 1872, the Klan was broken but this only lasted for a few
years.